Instaed of a hand wrench, use an impact wrench.

wrote in message
oups.com...
Has anyone used one of those combination punches (driven by a hand
wrench) that will make a 3.5 or 2.25 inch instrument hole in sheet
metal? How thick an aluminum panel will it go through? Were you happy
with the result? I'm thinking of fabricating a replacement instrument
panel and want it to look good.