I'm currently conducting an informal feasibility study regarding restoring a postwar police MkIV with a crossbolt safety. The only missing part I haven't been able to ID a source for is the mainspring as the usual suspects seem to be out of stock. A slight complicating factor is that mainspring on the crossbolt model seems to be smaller than the one on the 'standard' MkIV as it has a smaller frame. You can see an illustration here:

Webley Scott Ltd. Mk.IV Revolver. - Gun and Game - Firearms Forums

Does anyone have any leads on where one might be found? (Original or repro) Alternatively, are there any other revolver mainsprings that could be adapted to fit? Or how difficult would it be to bodge something that would work?

Grateful for any help.

Cheers,
Mark
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