Most of them are tight and holding well, but there is no way to tighten the loose ones. The snap still protrudes the normal amount. It's just the fastener that differs.Do they work?
I suppose I'll have to drill the heads off, like a rivet,
Yeah, probably so. Haven't tried at all to remove one yet so I don't know if I can lift them up enough to get to the shaft below.If they're loose, they're going to be a headache to drill out. They'll probably just spin.