Thoroughly deburred


Using a #2 center drill for the vent hole.


Scribing the centerline of the shell for the vent hole location. I don't do this with my good calipers.




The bottom bracket shells are from Henry James. I really wanted to use the heavy walled ones from Paragon, but they were out of stock. Since the HJ ones come out of a piece of tube, they need quite a bit of cleanup. I sanded them in the lathe.