Thanks Walter, so your 10.75 is the 520/3, your 8.75 is the 520/2 and lets hope your 6.75 is different than mine, so we can figure out if one of us has the 520/1 and the other has the plain 520...
I checked with Roly Williams, and his appears to be the same as mine, BUT his flywheel is 37mm, where one of mine is 45mm and the other is quite a bit chunkier at 50mm
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