Salty.... I am doing through wire with a Delta shopmaster mini drill press,,,$99 at lowes,,,, it does ok,,,,,,I use a short bit first then the long bit,,,,,, just have to go slow and make sure I set up a plumb line to a screw and center it before I get started,,, There is a page here on how to do it,,,
I think your plugs look great,,,, I could not imagine what you could do with an airbrush....... you could get one cheap from michaels and use the canned air or go to
www.bearair.com ....
I look forward to seeing more stuff,,,,,,