Thanks, all I could get out of them was this:My 1979 Renegade manual shows a cut-away drawing of the breech and it is shown as a round-bottomed cavity inside the patent breech.
T/C will not release the breech plug to any one (not even one of their warranty station). The breech plug has a very deep cone in the bottom and the breech plug and the snail are all one part.
If you need yours replaced, send it directly to T/C for any repairs. If you do anything to the breech end, it will void your lifetime warranty. "Yet they sell breech plug wrenches... Go figure!"
I guess the breech plug borders rocket science... :winking:
I'm sure that T/C uses the same design for all of their side-locks...