Has anyone come across any of these recently - I'm looking for the 7/8" (22mm) plastic backed snap on version in coarse and I don't seem to be able to find them anywhere - I used to get them from Fischer, but even if it weren't viable to buy there any more, they don't seem to have them now. I've also found them at dental and podiatry supply houses, but again, nothing.

If anyone has any brilliant ideas, I'd be grateful - I'm down to my last handful and use them constantly.