  == Using too high of a gauge ==  As it's personal experience I'm putting it here since it'd probably count as original research, but i seem to recall one time breaking the nut on the bass end of my first 6-string since I decided to try out a set of 13s and the .056 was far too much for it to handle.  Anyone else had similar problems before/feel that it's worth mentioning in the section on gauges?   