Ha ha, yes one of those would have been easier, but I worked with what I had at the time from the scrapyard in Saudi. The best motor and frame of the three I bought, was one of the F1’s with the 530 chain, but I didn’t want the rear disc set up, so ended up doing it all the hard way by getting 10mm machined off of the face of the hub where the sprocket goes. Then at some point in time, realised that the swinging arm was not symmetrical, probably when I was machining new rear wheel bushes.
Anyway it all looks pretty good so I will run with this set up for now.
This of course is the bike that when I have finished it, I have no idea if I can get it on the road here in Spain, as it has no papers😬