Z axis crank fix

[Toolmaker51]

Apparently, some import machine builders have gauging issues, no 5/8" Ø reamers, or combination of the two. Why else would a .625 shaft be matched with a .632 crank bore?
I'm constantly repositioning the knee. Lowering is faster taking a grip right at the hub and swiveling the crank just with wrist action. Ergonomics keep the handle in place, usually.
Raising it, handle constantly leaps off the shaft, due to shoulder and elbow getting the act. But fit of shaft and bore are the cause; clearance makes angularity, which disengages the teeth, then handle is out of it's arc of control. If it drops to concrete, loss of drive teeth is next.
After figuring how to clamp and indicate everything, I bushed it with a common bronze sleeve. A simple mod, and 100% effective.
The setup took work.
After checking teeth and front side for parallel [weren't];
1] strap clamp face directly on table. They're only dependable FAO surface [Finished All Over]. Hopefully related to establishing hole position.
2] skimmed half of exposed area with end mill, moved clamp and milled remainder.
3] set handle with teeth up on a spacer, two straps and a large washer over the teeth.
4] indicated existing bore AND inner side of teeth. Not perfectly concentric, reasoned teeth position as correct X .000 Y .000.
5] a light boring cut re-centered the two.
6] reamed 3/4".
7] pressed in bushing.
Click the pic.
Note worn paint. I do that Z swivel motion a lot.