I can confirm dimensions in acouple weeks (leaving on a trip). The bolts are M8x1.25 (I used 3/8" for clearance) , I believe spaced at 65mm. The crank bolt takes a 22mm socket, I think I used a 1 3/8" hole saw. The material I used was 3" wide 3/16" steel flat bar.
Thank you! Long time lurker! (before I created my profile)
I have seen several DIY tools (was going to use aluminum bar and some bolts) but didnt have a bit large enough for the socket hole,and wasn't going to get the CNC going for it. Now i'm in a pickle.
Ill send you a PM!