Ah. Blast. So, could I swap the free wheels? The Shim block is on a Khamsin wheel (don't ask!) and the Campag block's on a Mavic Racing 1 (from memory)...
By "free wheel", I assume you mean freehub.
I doubt they'll be compatible: beyond the spline pattern there is no standard.
Campag and Mavic offer both Campag and Shimano standard wheels, so you may find a suitable freehub as a spare, depending on the age of the wheels.
@Scilly.Suffolk started
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Ah. Blast. So, could I swap the free wheels? The Shim block is on a Khamsin wheel (don't ask!) and the Campag block's on a Mavic Racing 1 (from memory)...