Cog is drilled and mounted on the Project Curbside wheel. This was a bit of a task. I started with a very small bit, then had to drill the holes up one size at a time. I tried going straight to the finished size but the steel just hardened up immediately. A better cutting fluid than WD-40 might’ve helped.
Notes to self: 1) gloves are a very very good idea when holding a cog down while drilling 2) if you ever have to replace a cassette, Miche makes theirs from some extremely hard stuff.