Hi, I have a front caliper brake whose nut will only thread halfway onto the mounting bolt. I tried to use the nut from the back brake on the front bolt and it would not thread at all. (I had a couple other back brake nuts around and they wouldn't even thread on either...are they not compatible or do I have a bad bolt?). The brakes are new (Sram rival), I can't see anything wrong with the threads, I've cleaned both nut and bolt and lubricated, nothing. I get the nut about halfway down the bolt and it stops dead. I haven't tried to force it because I don't want to mangle anything. Any ideas on what's going on here?
Worse case: It looks like the center bolt may be removable and replaceable...is that right?