diff --git a/chapter-qkd/chapter.tex b/chapter-qkd/chapter.tex
index 1ef880a..7621e0f 100644
--- a/chapter-qkd/chapter.tex
+++ b/chapter-qkd/chapter.tex
@@ -683,7 +683,22 @@ common \qty{0.9}{\milli\meter} fiber pigtails.
 \todo{cite bend radius spec. fs.com has some on their pigtails. thorlabs on their SM-28 fiber has no spec, but specs
 loss at \qty{25}{\milli\meter} radius.}
 
-While 
+\begin{figure}
+    \centering
+    \subcaptionbox[Helical transition of single fiber]{Single fiber}{\includegraphics[width=.45\textwidth]{\scaledgraphics{helix_transition.png}}}
+    \hfill
+    \subcaptionbox[Helical transition of fiber bundle]{Fiber bundle}{\includegraphics[width=.45\textwidth]{\scaledgraphics{helix_bundle.png}}}
+    \caption[Helically coiling fibers inside the axis tube]{
+        The necessary mesh spacing can be reduced by coiling the fibers inside of the axis tube. The coiled fibers enter
+        the inter-mesh space at an angle equal to the helix lead angle, which reduces the amount of space necessary to
+        complete the transition to horizontal along a circular arc. In this example, a \qty{6}{\milli\meter} outer
+        diameter tube with a \qty{0.5}{\milli\meter} wall thickness is shown with 6 fibers with \qty{0.9}{\milli\meter}
+        outer diameter coiled to a constant bend radius of \qty{9}{\milli\meter}. The lead angle of the resulting helix
+        is \qty{61.5}{\degree}, and past the tube exit, only \qty{5.16}{\milli\meter} of inter-mesh space are necessary.
+        \figureattrib{helix_transition.png}}
+\end{figure}
+
+Based on these specifications and adding some  \qty{10}{\milli\meter}, 
 
 \todoplaceholder{Finish this part.}
 
diff --git a/chapter-qkd/figures/gear_plan_1.svg.latex_meta b/chapter-qkd/figures/gear_plan_1.svg.latex_meta
index 3c5a4c1..1d6732a 100644
--- a/chapter-qkd/figures/gear_plan_1.svg.latex_meta
+++ b/chapter-qkd/figures/gear_plan_1.svg.latex_meta
@@ -1,6 +1,6 @@
 \def\resourcestate{\draftgraphics}
 \def\resourcescale{}
-\def\resourceurl{https://git.jaseg.de/ihsm-secondary-mesh.git/plain/gear\_plan\_1.svg?h=ecb75393966ba4475f31ebbe91e4afffd6928bdf}
-\def\resourcerev{ecb7539}
+\def\resourceurl{https://git.jaseg.de/ihsm-secondary-mesh.git/plain/gear\_plan\_1.svg?h=601159904f4269366e29d85c2e90cbf000157f4f}
+\def\resourcerev{6011599}
 \def\resourcerepo{ihsm-secondary-mesh.git}
 \def\resourcepath{gear\_plan\_1.svg}
\ No newline at end of file
diff --git a/chapter-qkd/figures/gear_plan_2.svg.latex_meta b/chapter-qkd/figures/gear_plan_2.svg.latex_meta
index fd6c10d..b5d7a82 100644
--- a/chapter-qkd/figures/gear_plan_2.svg.latex_meta
+++ b/chapter-qkd/figures/gear_plan_2.svg.latex_meta
@@ -1,6 +1,6 @@
 \def\resourcestate{\draftgraphics}
 \def\resourcescale{}
-\def\resourceurl{https://git.jaseg.de/ihsm-secondary-mesh.git/plain/gear\_plan\_2.svg?h=ecb75393966ba4475f31ebbe91e4afffd6928bdf}
-\def\resourcerev{ecb7539}
+\def\resourceurl{https://git.jaseg.de/ihsm-secondary-mesh.git/plain/gear\_plan\_2.svg?h=601159904f4269366e29d85c2e90cbf000157f4f}
+\def\resourcerev{6011599}
 \def\resourcerepo{ihsm-secondary-mesh.git}
 \def\resourcepath{gear\_plan\_2.svg}
\ No newline at end of file
diff --git a/chapter-qkd/figures/gear_plan_3.svg.latex_meta b/chapter-qkd/figures/gear_plan_3.svg.latex_meta
index 51d8ad3..99eeaa2 100644
--- a/chapter-qkd/figures/gear_plan_3.svg.latex_meta
+++ b/chapter-qkd/figures/gear_plan_3.svg.latex_meta
@@ -1,6 +1,6 @@
 \def\resourcestate{\draftgraphics}
 \def\resourcescale{}
-\def\resourceurl{https://git.jaseg.de/ihsm-secondary-mesh.git/plain/gear\_plan\_3.svg?h=ecb75393966ba4475f31ebbe91e4afffd6928bdf}
-\def\resourcerev{ecb7539}
+\def\resourceurl{https://git.jaseg.de/ihsm-secondary-mesh.git/plain/gear\_plan\_3.svg?h=601159904f4269366e29d85c2e90cbf000157f4f}
+\def\resourcerev{6011599}
 \def\resourcerepo{ihsm-secondary-mesh.git}
 \def\resourcepath{gear\_plan\_3.svg}
\ No newline at end of file
diff --git a/chapter-qkd/figures/helix_bundle.png b/chapter-qkd/figures/helix_bundle.png
new file mode 100644
index 0000000..1d7faac
Binary files /dev/null and b/chapter-qkd/figures/helix_bundle.png differ
diff --git a/chapter-qkd/figures/helix_bundle.png.latex_meta b/chapter-qkd/figures/helix_bundle.png.latex_meta
new file mode 100644
index 0000000..d80895d
--- /dev/null
+++ b/chapter-qkd/figures/helix_bundle.png.latex_meta
@@ -0,0 +1,6 @@
+\def\resourcestate{\draftgraphics}
+\def\resourcescale{}
+\def\resourceurl{https://git.jaseg.de/ihsm-secondary-mesh.git/plain/helix\_bundle.png?h=601159904f4269366e29d85c2e90cbf000157f4f}
+\def\resourcerev{6011599}
+\def\resourcerepo{ihsm-secondary-mesh.git}
+\def\resourcepath{helix\_bundle.png}
\ No newline at end of file
diff --git a/chapter-qkd/figures/helix_transition.png.latex_meta b/chapter-qkd/figures/helix_transition.png.latex_meta
index 7925115..5e2cde9 100644
--- a/chapter-qkd/figures/helix_transition.png.latex_meta
+++ b/chapter-qkd/figures/helix_transition.png.latex_meta
@@ -1,6 +1,6 @@
 \def\resourcestate{\draftgraphics}
-\def\resourcescale{scaled down for preview}
-\def\resourceurl{https://git.jaseg.de/ihsm-secondary-mesh.git/plain/helix\_transition.png?h=ecb75393966ba4475f31ebbe91e4afffd6928bdf}
-\def\resourcerev{ecb7539}
+\def\resourcescale{}
+\def\resourceurl{https://git.jaseg.de/ihsm-secondary-mesh.git/plain/helix\_transition.png?h=601159904f4269366e29d85c2e90cbf000157f4f}
+\def\resourcerev{6011599}
 \def\resourcerepo{ihsm-secondary-mesh.git}
 \def\resourcepath{helix\_transition.png}
\ No newline at end of file
diff --git a/chapter-qkd/figures/ihsm-secondary-mesh b/chapter-qkd/figures/ihsm-secondary-mesh
index ecb7539..6011599 160000
--- a/chapter-qkd/figures/ihsm-secondary-mesh
+++ b/chapter-qkd/figures/ihsm-secondary-mesh
@@ -1 +1 @@
-Subproject commit ecb75393966ba4475f31ebbe91e4afffd6928bdf
+Subproject commit 601159904f4269366e29d85c2e90cbf000157f4f
diff --git a/chapter-qkd/figures/render_exp_1.png.latex_meta b/chapter-qkd/figures/render_exp_1.png.latex_meta
index 3d6ead9..14cfe46 100644
--- a/chapter-qkd/figures/render_exp_1.png.latex_meta
+++ b/chapter-qkd/figures/render_exp_1.png.latex_meta
@@ -1,6 +1,6 @@
 \def\resourcestate{\draftgraphics}
 \def\resourcescale{}
-\def\resourceurl{https://git.jaseg.de/ihsm-secondary-mesh.git/plain/render\_exp\_1.png?h=ecb75393966ba4475f31ebbe91e4afffd6928bdf}
-\def\resourcerev{ecb7539}
+\def\resourceurl{https://git.jaseg.de/ihsm-secondary-mesh.git/plain/render\_exp\_1.png?h=601159904f4269366e29d85c2e90cbf000157f4f}
+\def\resourcerev{6011599}
 \def\resourcerepo{ihsm-secondary-mesh.git}
 \def\resourcepath{render\_exp\_1.png}
\ No newline at end of file
diff --git a/chapter-qkd/figures/render_exp_2.png.latex_meta b/chapter-qkd/figures/render_exp_2.png.latex_meta
index 9c991d1..275fb21 100644
--- a/chapter-qkd/figures/render_exp_2.png.latex_meta
+++ b/chapter-qkd/figures/render_exp_2.png.latex_meta
@@ -1,6 +1,6 @@
 \def\resourcestate{\draftgraphics}
 \def\resourcescale{}
-\def\resourceurl{https://git.jaseg.de/ihsm-secondary-mesh.git/plain/render\_exp\_2.png?h=ecb75393966ba4475f31ebbe91e4afffd6928bdf}
-\def\resourcerev{ecb7539}
+\def\resourceurl{https://git.jaseg.de/ihsm-secondary-mesh.git/plain/render\_exp\_2.png?h=601159904f4269366e29d85c2e90cbf000157f4f}
+\def\resourcerev{6011599}
 \def\resourcerepo{ihsm-secondary-mesh.git}
 \def\resourcepath{render\_exp\_2.png}
\ No newline at end of file
diff --git a/chapter-qkd/figures/render_side_1.png.latex_meta b/chapter-qkd/figures/render_side_1.png.latex_meta
index bac054c..b065e77 100644
--- a/chapter-qkd/figures/render_side_1.png.latex_meta
+++ b/chapter-qkd/figures/render_side_1.png.latex_meta
@@ -1,6 +1,6 @@
 \def\resourcestate{\draftgraphics}
 \def\resourcescale{}
-\def\resourceurl{https://git.jaseg.de/ihsm-secondary-mesh.git/plain/render\_side\_1.png?h=ecb75393966ba4475f31ebbe91e4afffd6928bdf}
-\def\resourcerev{ecb7539}
+\def\resourceurl{https://git.jaseg.de/ihsm-secondary-mesh.git/plain/render\_side\_1.png?h=601159904f4269366e29d85c2e90cbf000157f4f}
+\def\resourcerev{6011599}
 \def\resourcerepo{ihsm-secondary-mesh.git}
 \def\resourcepath{render\_side\_1.png}
\ No newline at end of file
diff --git a/chapter-qkd/figures/render_side_2.png.latex_meta b/chapter-qkd/figures/render_side_2.png.latex_meta
index 2e51db8..6a566a1 100644
--- a/chapter-qkd/figures/render_side_2.png.latex_meta
+++ b/chapter-qkd/figures/render_side_2.png.latex_meta
@@ -1,6 +1,6 @@
 \def\resourcestate{\draftgraphics}
 \def\resourcescale{}
-\def\resourceurl{https://git.jaseg.de/ihsm-secondary-mesh.git/plain/render\_side\_2.png?h=ecb75393966ba4475f31ebbe91e4afffd6928bdf}
-\def\resourcerev{ecb7539}
+\def\resourceurl{https://git.jaseg.de/ihsm-secondary-mesh.git/plain/render\_side\_2.png?h=601159904f4269366e29d85c2e90cbf000157f4f}
+\def\resourcerev{6011599}
 \def\resourcerepo{ihsm-secondary-mesh.git}
 \def\resourcepath{render\_side\_2.png}
\ No newline at end of file
diff --git a/chapter-qkd/figures/scaled-helix_bundle.png b/chapter-qkd/figures/scaled-helix_bundle.png
new file mode 100644
index 0000000..52f0e88
Binary files /dev/null and b/chapter-qkd/figures/scaled-helix_bundle.png differ
diff --git a/chapter-qkd/figures/schema_wire.svg.latex_meta b/chapter-qkd/figures/schema_wire.svg.latex_meta
index a0e4218..08cbff4 100644
--- a/chapter-qkd/figures/schema_wire.svg.latex_meta
+++ b/chapter-qkd/figures/schema_wire.svg.latex_meta
@@ -1,6 +1,6 @@
 \def\resourcestate{\draftgraphics}
 \def\resourcescale{}
-\def\resourceurl{https://git.jaseg.de/ihsm-secondary-mesh.git/plain/schema\_wire.svg?h=ecb75393966ba4475f31ebbe91e4afffd6928bdf}
-\def\resourcerev{ecb7539}
+\def\resourceurl{https://git.jaseg.de/ihsm-secondary-mesh.git/plain/schema\_wire.svg?h=601159904f4269366e29d85c2e90cbf000157f4f}
+\def\resourcerev{6011599}
 \def\resourcerepo{ihsm-secondary-mesh.git}
 \def\resourcepath{schema\_wire.svg}
\ No newline at end of file