Originally Posted by
Kontact
I think you might have missed what I was suggesting. If you face your frame down to 71, and 71 is already a common width for these frames, you have kept it "original", and then you can use a Velo Orange threadless BB.
As for Italian, that is not just a change in thread by diameter as well - 36mm is 1.42" vs. English 1.37. So the threads are likely to be better formed, if a bit harder to machine in the first place.
I believe all the Phil Wood cartridges the retaining rings are just a slip fit onto the ends where the bearings stick out. My original plan was to use the PW Raleigh Super Corsa retaining rings on a 73 mm cartridge — is supposed to be a drop-in solution. But since neither of those parts is available, the plan changed to find the longest cartridge I can and machine my own rings. I think it will work out better since even if the cartridge turns out to be 68, I should be able to compensate by making the rings thicker at their ends to make up the difference.
I checked the lathe and made sure I've got a 16 and a 52 gear. I'm waiting on a piece of 6061 T6 1.5 inch stock and the cartridge. I'm kind of excited to do this. ..Pretty sure it will work.
1928 South Bend 8" Classic and vintage machine tools lol