Originally Posted by Beerwolf
One other option is to find an Electrician and make him your best friend in the world and ask if he has any Greenlee punches that go that big. That is what I used on my keg conversions and they are slicker than poop thru a goose
That would make the cleanest ho' IMHO. I've had mixed results with ho'saws in steel. Especially big ones. Pretty easy to dull the cheap ones down if you're not careful. Oil the cutting teeth frequently while cutting.
Still, might be easier to find a friendly trademans with a Greenlee punch who'll trade makin' a ho' for a fatty...