I have an old Western Flyer-branded 3 speed bike from the 1970s, which I got for $100. I've spent another $100 fixing it up and had been using it to commute to work for a few months, until the rear hub gave out. The 3-speed hub is an old Shimano model from the 1970's, from what I can tell, and is more similar to a Sturmey-Archer than a modern Nexus hub. I believe the internal gears are damaged, and Shimano never made any replacement internals available in this country.
Has anyone tried swapping out the internals on one of these old shimano hubs, and replacing them with readily available Sturmey-Archer internals? I looks like the diameter is the same, but I don't know if it would be compatible in any way. I would buy a new hub, but rebuilding the wheel will be expensive (or very time-consuming).
If it can't be fixed, I may get a single-speed freewheel and hub instead. But I would love be be able to keep the original look and gearing.