dpb wrote:

The way to get the hole is a Greenlee punch, btw.

Nice way to do it, it appears, but my way was a weeee bit
cheaper don't ya think? These punch kits are hundreds of
dollars, some, *many* hundreds of dollars. And as far as renting
one, the guy at my local tool rental place suggested taking the
entire sink to a machine shop! So I doubt they rented out these
punches.