I bought a set of the Mittler Brothers punch and flare dies a couple weeks ago... they come with a 1/2" fine thread bolt and bearing to hold them together. Drill the 1/2" centering hole... assemble the punch and die and I've run them through 18g with my dewalt electric impact with ease. Very. Very. Nice.
Just punched a 1 3/4 hole in a firewall yesterday buy just running through the punch but not enough for the flare.. a tap or two with hammer and dolly and it was a perfect hole on a flat firewall.
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