It sounds like the OP is talking about Gary's bushings... Gary (I think that
was his name) passed a while ago. It has since been discovered that
one of his batches of bushings was bad somehow, other's have also
reported failures. Mostly, though, his bushings were good.
Those xf6-custom ones are supposed to be good too.
-Mike
I think it was an early batch of dampeners (that crumbled), not shock bushings... I could be wrong.