Are you using a stanadard 1500 watt element? In order to get them to fit in a 1" copper pipe, you have to give the end a few whacks with a hammer and then make sure the middle isn't touching. It slides right in then. I've built close to 20 of them this way.
Tap#1 = Beer
Tap#2 = Beer
THey change to often to keep up with the Sig.