Looking for O-ring front tires at Ace Hardware, I found these "Danco #32 Slip Bibb Gasket" faucet washers at $1 apiece
My custom sized gizmos cost almost nothing and take very little time.
I'll bet you can find some used JK 3/32 X .400 plastic hubs for nothing.
First, narrow the hubs on your truer as desired and sand off the flash nubs.
The washers are a perfect snug fit, trim and true quickly, precisely, and can easily be re-used.
I did two at a time today, worked perfect.
Jig wheel math:
Desired clearance .039" X 2 = .078
Desired wheel OD .680 - .078 = .602"















