Great job! Now I have a straight forward guide to do the converison

Thanks alot.
The jig tip is brilliant.
I have one question tho, you said and showed that you enlarged the hole for the outer bearing, no big deal, but the inner one then? The 15x21? Did you actualy press it in the 12x18 stock bearings seat without makeing the seat bigger?

Did you use a regular metal drill to do the outer bearing seat bigger?
Once again, Great job!