If they get hot enough and they're clamped too hard, they will squish. I've had a few go out of alignment on me because I took too long to solder them and they overheated which allowed the contacts to drift. Happens much more readily with 12 AWG wire and up. They say not to solder them plugged in but it helps a lot.
Last edited by What's_nitro?; 09.23.2007 at 11:00 PM.