I don't use a drill press for micro drills. mine doesn't go slow enough, so I just turn the bit by hand. I've had a few break, but they're cheap. at the rate I buy them it's cheaper than buying jets.Unless you have a very accurate and expensive drill press and jig holder, it is much better to simply buy a range of jet sizes from No #65 to No #86, in individual sizes, eg #65, #66, #67, #68 etc
I have every numerical jet size from No #65 to No #90.
A full compliment range of jets is the only way to properly dial in your carburetter.
In the lower south eastern part of Australia, using the highest octane (non ethanol) pump grade fuel, most of my engines fall into a jet size zone of No #76, though i have had one engine that ran optimally on a No #70 jet and another engine that ran optimally on a No #86 jet.
I don't drill other people's jets and I do all my own repairs so you'll be happy to hear that you'll never have a bike come in that I've drilled the jets in.
I don't get rid of anything, I use it until it breaks, fix it if I can and keep it for parts if I can't. if there's nothing worth keeping on it I'll send it to the scrappers, and if you're buying engines from the scrap yard you better be able to figure out something as simple as a drilled jet.