I’ve read that old school upholstery guys would hold a handful of tacks in their mouth and spit them one by one onto the magnetic end of the hammer, leaving the other hand free to hold the fabric. Hence the expression “he’s so mad he’s spitting tacks.”
Yes. And that's why good upholstery tacks came in boxes marked "sterilized". Because you'd frequently be piercing yourself. Anyway, I left that part out of my description just so I wouldn't give people ideas. But yeah, you fish through the box with the magnet and put that dangling wad of tacks in your mouth. Hands are free at all times.
Old school upholstery shop near me does the spit & swat technique , but only for decorative tacks. Mostly pneumatic staplers now.
Well, here's the thing. Good decorative tacks are brass and don't work with the magnetic hammer (I can't afford a brass magnet). Brass plated steel tacks are magnetic, but you still can't do the spit & swat with decorative tacks, because their placement needs to be too well aligned.
Anyway, yeah, pneumatic staples are more often used on webbing nowadays. Tacks are easier to remove for future repair, and that's still what I'd use on an heirloom piece.