as soon as I get it running, I might find I need one!! this duster hd actually 2 VR screwed on, (why!? ha!)......
anyway, the type VR is related to having an alt. with the 1 or 2 field wire setups! I guess. I had it in my head it was related to having a points OR electronic dist. all these decades! hey I have NEVER claimed to have any great mechanical smarts!!!