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Re Jo's comment about hoping to find the bits of this engine, thirty years ago, on a local market stall, I came across two untouched, still packaged sets of castings, for this Williamson engine, and the Stuart turner Triple. They were thirty quid a set, so I just bought the set for the triple.... Dave
When I've bored the cylinder I like to make the opening 2mm larger where the covers fit so any later honing doesn't affect the fit of the covers. Geoff