In reply to alifontbin:
Ha, the dreaded "clicky"! They occur sometimes and we don´t really know why it affects some bolts and not others. Single shaft bolts seem more prone than Buhler type ones but it might just be we´ve noticed more of them.
The fundamental reason it occurs is the resins used to glue bolts in shrink and the bond to the metal gives way. Different resin types and the amount and type of filler used varies the actual shrinkage and some resins are also possibly more elastic than others but it something that occurs with almost every brand I´m aware of. Installation temperature might have something to do with it as well but that´s merely conjecture and something we´d have to test.
If it´s one of my lower-offs then rest assured it still won´t come out, 20 minutes with a wrecking bar and a drill is what it takes and they still get the standard (at least the one I´ve tried did).
The cure is to drill a 10mm hole down alongside the shaft, put some resin in and then hammer a 10mm SS threaded rod down the hole. Doesn´t do the drill bits a lot of good so use an old one!
