Wrap the breech with duct tape.
Had one come apart on me once.
Of course I was using acetylene, maybe not such a good idea now. But at the time, it seemed reasonable.
We used to take the torch and get it going and dial in the oxygen and acetylene so that you had a nice blue flame going, then smack it on the ground to put the flame out and then put the torch head inside a hefty trash bag and fill it up. Next take it well away from everything. Take some gasoline and make a fuse/trail and then light it and hold your ear drums. Getting the right ratio of oxygen and acetylene in the bag proved to be the key to making it go boooooooom.
