Sorry to sound negative, but I think you'll find it very difficult to make a new end, (been there, tried that).For a start, you have to get enough of the central coils out to be able to heat the end to red-hot, without affecting the rest of the adjoining coils. If you did manage to do that, then the new "kink" you make in the end has to be perfectly square, and fit the groove in the winding cog exactly, or it will pop out at the first winding. The new end will also now be further away from the centre of the drum, and it's a helluva job to get it back to the centre and to stay there, which it needs to do, or it won't grip the winding gear. Plus, if it has broken once, the chances are that the spring is fragile, and will probably break again in the near future. Less trouble to just buy a new spring?
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