It would be really useful if someone who's made the fix could post the spring part number (if it has one) or give the dimensions, so that I can try to source a replacement spring. The post above does try to show the spring measurements, but this is not entirely clear and is for the modified spring rather than the original one.
So far (without the dimensions) I seem to be able to buy from USA on EBAY (outrageously priced at £25), or from Alibaba, at a reasonable price but with 75 day delivery.
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