Just a small update. For a time my Thompson has been disconnecting in full auto unless I push forward on the handguard. Nothing seemed out of order and I surmised that sheer inertia was tripping the disconnect after its spring had worn down some. Pushing forward merely cushioned the blow of the bolt. I couldn't replace the spring outright with a stiffer one as it's in a balance between being stiff enough to hold the disconnect and soft enough to be tripped by the bb follower. To cut things short, I just had to stretch the spring (part no. 66) out by 10° and retempered giving it just a little more pre tension.