Now, here's the actual method I used. Remove the 3 screws shown below:

Now remove the camera mechanism from the body. Remove the two screws retaining the plate which covers the winding mechanism. TAKE CARE! It might spring apart. Mine did, I spent ages working out how to get the bits back together. Remove the take up spool and wind on wheel. Dismantle, and remove and discard the spring. Reassemble sticking the whole lot solidly together with superglue

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