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My Bens are Style 2, made from 1927 to 32, and the mainspring barrel is held in place on the frame with three screws: take the back off, loosen the case screws, lift out the innards, undo those three screws, wiggle the barrel out, wiggle the new one in, rescrew, put the works back into the case, screw the back back on, and you're done, easy breezy lemon squeezy. The worst that can happen to these models is for the pot-metal base to crack and chip -- nobody makes reproductions of these, so you have to improvise with epoxy and paint if the rot strikes.
I have had the base go on me before. I know that is the biggest problem. :eusa_doh: