I had a shark fin on the factory wheel of my BSA 10-50x60. When I had the opportunity to acquire a Jon Harris side wheel that replaces the BSA side wheel rather than fits on it, I jumped on it like a starved chihuahua on a steaming lamb chop.
Never looked back. The Harris Wheel is a lot lighter, looks like the Dog's Whatsits, and is a pleasure to use. Fit and finish is immaculate.
I have no Jon Harris stock and he doesn't pay me. Yet I cannot recommend his work enough. Top bloke, superb wheels.