[quote=leeboweffect][quote=P.M.]When I read this I had to scratch my head and go fix a double bourbon. There is no way a center punch like these are going to crush/deform AL tubing.
http://www.homedepot.com/…r-Punch-70079H/206007134
https://www.harborfreight…ed-center-punch-621.html
[/quote]
Most folks have never seen a spring loaded "automatic" center punch. The old punch in left hand, hammer in right hand smack it method prevails in home shops. Agreed the "automatic" type wouldn't crush the tube, but it will not help with centerline accuracy as the drill guide will.[/quote]
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