Carb tuning, larger accelerator pump nozzle?

I take a piece of 3/8 round aluminum and drill and tap that for 6-32 or whatever size you are drilling. Then I get that in the lathe and turn that while I drill them.

You can do the same with a drill motor. Just stick the drill in a vise to hold the drill, put your brass holder in the Chuck and hit the button that holds the power on and then drill your brass.

I’ve never been able to drill anything with just the pin vise. Of course, I’m old, fat and lazy so there is that.