My #2 snap disk is mounted on the right side of the fire box next to snap disk #1. It has black and orange wires running to it. The manual for older ones say it is mounted on the drop tube. You should be able to access it by taking off the right side cast iron piece. It's just held on with two Phillips screws. If you want to pull out the stove (major PITA), you should have two quick connect snaps that will separate the piping from the combustion blower. That gasket is pretty stout and shouldn't need replacing but it wouldn't hurt to have one on hand anyway.
In any case, #2 is a safety against overfiring and should not be bypassed for any length of time. You DO have your flame height set correctly in HIGH heat position, right??????
In any case, #2 is a safety against overfiring and should not be bypassed for any length of time. You DO have your flame height set correctly in HIGH heat position, right??????