I've gotten a lot of info from reading Joey and Coos's posts and replies over the years.
Never found them to be other than polite and helpful, though neither one will spoon feed you (which is appropriate).
FWIW, my understanding is that Joey's cue business is a side gig, too?
The reason i asked what you are specifically looking for regarding air mods if necessary to your purpose?
Is because there are surplus dealers who sell used and re-sharp gun drills for a fraction of new cost. But you have to know 1.) what you are buying. 2.) have some facility for adapting, or modifying, or sharpening, what you buy. 3.) might have to keep checking inventory to see when what you need actually comes in.
I think it is prudent that that is AFA i want to say.
Sterling will make exactly what you need, at a very fair price, available on predictable schedule.
smt