diff --git a/README.md b/README.md
index 7fa8661cbb54d7f921651073619ed5903f60e03d..488eb6d7a855d9fef65c8c0d8e3abcd760ebf6b8 100644
--- a/README.md
+++ b/README.md
@@ -44,4 +44,10 @@ Make sure to change 'type' to .step, and check the 'save to my computer' box. No
 ![n17pp](n17_linearPulley/n17pulley.jpg)
 
 ### [N23 Linear and Pinion-Type Belt](n23_linearPinion/)
-![n23lp](n23_linearPinion/RCTN23-alu-img.jpg)
\ No newline at end of file
+![n23lp](n23_linearPinion/RCTN23-alu-img.jpg)
+
+## Bonus Kit
+
+### [E Chain with Tape Measure Backbone](tapeChains/)
+
+![tc](tapeChains/tapeChains-2.jpg)
\ No newline at end of file
diff --git a/n17_linearPinion/README.md b/n17_linearPinion/README.md
index 2a5737aaa2ac67e0249968fbc28213a176d09e71..7d7de51a1b4ba29e3420b2e0516166a029493e04 100644
--- a/n17_linearPinion/README.md
+++ b/n17_linearPinion/README.md
@@ -11,6 +11,7 @@ Smaller Gantries. Uses 45* bearings in 3DP blocks, with one set riding on flexur
 ### Development Notes ... 
 - while heat-setting M4 inserts in for the rollers, (1) there isn't *really* enough space to get the soldering iron in (without melting the adjacent pla) and (2) it's difficult to guarantee these go in straight. maybe use a press-in insert? / a hex nut ? 
 - long runs (beams) are not stiff ... try 1/8" waterjet stiffening folded members 
+- in the fullness of time, add an N23 size for torque-y applications like the CAT's bed: this is minimal overhead.
 
 ### BOM for N17 
 
@@ -34,4 +35,5 @@ M4 Washers | - | 4 | ibid | McMaster | 93475A230
 
 ### Materials for N17
 
-1/4" Acrylic from McMaster, for 12x24" for small lasers pick 8505K755 
\ No newline at end of file
+1/4" Acrylic from McMaster, for 12x24" for small lasers pick 8505K755   
+1/4" ALU 6061 Typical (6.35mm)
\ No newline at end of file
diff --git a/n17_linearPulley/README.md b/n17_linearPulley/README.md
index 4054ce01d41c80446fcb6661a6935989e2a8cce6..3d2507581d963c29fcbfeef04d538af21a9e9919 100644
--- a/n17_linearPulley/README.md
+++ b/n17_linearPulley/README.md
@@ -1,6 +1,6 @@
 ## Gantry for NEMA17 Motor, 0.25" Stock, Pinion-Type Belt
 
-**STATUS:** mistakes abound, works but assembly and belt-tensioning are not wonderful.
+**STATUS:** mistakes abound, works but assembly and belt-tensioning are not wonderful. CAD model and actual typical assembly do not reflect one another.
 
 **USED IN:** [Little Rascal](http://gitlab.cba.mit.edu/jakeread/littlerascal)
 
diff --git a/tapeChains/README.md b/tapeChains/README.md
index 868665f809ca065741b3c7a4a401efdd34005636..727d8744bb13fa8faecd9fddc7e5188379ce9ff4 100644
--- a/tapeChains/README.md
+++ b/tapeChains/README.md
@@ -1,5 +1,9 @@
 ## HQ Wire Bundling
 
+Cable Routing is the ad-hoc machine builder's 'come to jesus' moment, every time. Here is a project that aims to help ye faithful straighten out.
+
+Original credit to [the unlinked hero in this Hackaday article](https://hackaday.com/2017/12/17/diy-cable-chain-looks-great-stays-cheap/)
+
 Trying this with Heat Shrinks
  - -> 1" 3M161381-ND
  - -> 0.75" 3M161354-ND