Save me from madness. I have a later E3L dynamo that I want to replace with a correct E3HM-LO. (I'm going for LED bulbs.) Do both dynamos use the same drive pinion? My later long 'un has a pinion fitted. Will a long fixing nut used on the short model fit this to its tapered shaft? All of the exploded diagrams I've found show later parallel armatures.
Thank you; that explains it. I've been over-thinking this one.
The HM-LO dynamo I have has an externally threaded, tapered armature shaft. One parts provider refers to this as an esrly BSA type, which I mistakenly assumed to include the WM20.