The fist problem is of course the mainspring, it needs to deliver its power "backwards", so the barrel drum needs a new outer edge for the mainspring to hold on to. The drum is made out of brass and can easily be carved to the right shape.
The picture shows an original drum and my modified one, I see now that my drum is not as smooth on the bottom, so I will probably change the drum, but for now it works just fine.
The barrel arbor needs a reversed hook, to be able grip on to the mainspring in the opposite direction. This was done with a small file, and simply shaping a new hook on the backside of the original one.
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