...and by the next day or 2, apparently I meant "a flippin' week later!"
Hadn't heard from the machine shop all week. Went in this AM to check and see what was going on with my gear, and there it sat on the counter, just like I left it a week earlier. I was a little peeved, but glad I went in to check on it.
They called me back at around 1pm to tell me it was done. I just went and picked it up, and hopefully all is well. I had them measure out 197.5 degrees from the mark on the outer edge, and then come in to center, and drill a hole at the same distance from center as the outside edge of the other 2 existing slots on the gear.
...I'm tempted to skip seeing Borat with friends tonight so I can go install this. I'm so excited right now.