Graham I was talking to James Geddes today who confirmed that cover is 3 piece, the chrome band holds it together.
However he had a warning, the ‘New’ Comfort tyres now available for the ‘Stop’ wheels are actually larger than the original 1930’s ones (Michelin claim they aren’t but James and John Gillard are, from experience, adamant that they are so don’t fit under an original size cover so if you do get one made, make sure it’s for a modern tyre, not an original 1930’s one as when you come to replace them in the future, the cover won’t fit.
David Faulkner