About 2300 diamondsI have no idea how many he has.
It would be a shame if he really needed 2400 chips to get enough practice in, just so the first 100 derbys don't get F UpAre you sure 2300 chips will be enough?
I’d go with a 7/8” bit personally, that’s what I use. If you’re going to mill THCs 1” is larger than the center recess and it’s going to give to a weird oversized inlay...