Originally Posted by
CliffordK
Yep, that's the one.
Have you actually done the sandpaper idea? How well did it hold up?
Of course a new clamp would have the same weaknesses of the old one, but perhaps would be ok if tightened down properly.
Not sandpaper but coarse SHARP biting grit, and it works fine if compressed between mating surfaces. The quality of the fit and size of the grit are key because it needs to be squashed tightly enough to be forced into both surfaces to do the job. But, yes, it can provide very strong hold.
Likewise a new clamp (if you can make or find a reducer). These depend on a "gear mesh" of the ridges, not some random fit. Once meshed and clamped they are very secure and can stay that way forever. They get a bad rap because people ride them loose, which allows movement and wear until the quality of engagement is totally compromised. Same issue as Sq. taper cranks, or using a sloppy wrench on hex nuts.
I suggest a new clamp because it's a cheap enough answer, but I suspect that the old one may not use a reducer you can transfer, so you'll need a 7/8" to 5/8" bushing (split) to use the original pin.