A while ago I posted looking for pinch rollers for my JVC TD-W354 cassette deck. I ended up finding a size that I could make work and found a metal spindle shaft to cut and use for the center axis. I then purchased copper washers that I hammered down to a shim size then used them to center the rollers into the arm. Ended up working excellent. New belts while I was in there.
Pictures below:
Pictures below: