Tapmatic power tapper for 10 bucks. Not quite but close.

[Toolmaker51]

Dynamite background on handheld tappers jjr2001; press mounted or not. Many were used in assembly of various commercial products and barely operative now. But compared to dedicated press only units [ETTCO, Tapmatic, Pyramid, etc] all IIRC require a tommy to function. Handheld units were sold by dozens of outlets; Western Auto, Sears-Craftsman, Ace Hardware, Chicago Specialty, Ridgid, Millers Falls etc, but all retained the distinctive looking ribbed body of Supreme or Superior.

I'm into these at the moment with 240 1/4-20's in 4 10' strips of 3/8" hot rolled. I haven't got a suitable alternative, that weight won't center up easily to draw a tap on a drill press.

I'm mounting E-track to my tiltbed [lol] machinery trailer. I anticipate clamping on three saw horses and having at it 1-2-3-4 in a row. Drilling is a different story; found well priced headed #7 drill bushings at both Victor Machinery and paybay. The jig should be done by Thursday, clamping, location and all. 12 bushings, 10 'active', 2 with #7 drill blanks overlapping previous holes, preserve the 2" distance between centers.
https://www.victornet.com/department...hings/270.html
Choice went to paybay this time with a seller offering slip renewable versions I find more universal. In this jig they'll be light press fit but an individual can't wear them out in a lifetime.