There are metric and SAE STLs, pick the one you like. Use the SCAD if you need more changes.The SCAD here will still make the original Raldrich design - just put "constaint" to 1. I tweaked the smooth rod radius up a little - it was way too tight when I printed it. If you find different results, tweak away at the scad.
I'm a computer person who grew up on a farm. I enjoy all kinds of making. Programming, electronics design, rough carpentry, whatever.I am a mentor for FIRST Robotics FRC team 1502, "Technical Difficulties" at Chelsea High School.