Love the Franken-Bike!

Hell its a while since i put those those pics up lol. Mine was a bit of a cock up but worked good. Bikes long gone--to happy Vintage MX racing 'land' & still running i did hear [amazingly]. Others will chime in but the best plan is to run it from the inside not outside as i did retained by the little cover. Will be machining of sorts as the old worm will need removing. I haven't done it that way [correct way] so can't really offer much help sorry. By memory i probably thought that sitting it inside would run into the sprocket but maybe i was thinking of fitting it wrong way around by mistake. I dunno, too long ago. It'll work better too due to its 4 start worm instead of 3 start. Cheers.

It needs some minor machining, you could do it with a large drill. The center hole needs to be bored & then relocate the mounting holes.

Getting ready to try the mod to the R-5 actuator. Does anyone know if the cover needs to be machined to allow the new actuator to sit at the same depth as the old one, or can I just bore out the hole and let the R-5 part stick out further? It looks like boring just the hole would leave the new part sticking out about 1/4" further.