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    Hi Don,
    I have this problem quite a lot, first check the spur on the arbor to make sure its not rounded, it should have a dead flat face or a slight hook to it. Next look at the eye on the inner coil of the spring to make sure it is not distorted. Its not unknown for the eye to distort as the ends of the springs are left soft. If all looks good you need to grab the inner end of the spring and bend it into a tighter c shape, if it goes L shaped it wont work. I know at times I have had so much trouble with mainspings not being picked up by the arbor, it all looks fine but just wont grip, very frustrating! Good luck and let us know how you get on.