paperpuncher
Gold $$ Contributor
You asked for outside the box so.... My guess is it is locking mechanically. You might try to make a tool that could be suspended in the chamber while the cast is made,the other end would extend outside the back of the action. Use this end to unscrew the casting.. When the casting is ready to remove this would allow you to turn the casting from the back while tapping out from the muzzle.
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