LF: 1-3/4" Glass hole saw (ScubaSteve trade)

[2pts]

If you are redrilling, my advice would be to predrill a piece of plywood with a 1 3/4" wood bit, clamp that piece of plywood to the front with the hole lined up where you want to drill your new hole. It will give your glass hole saw a guide so your not having it spin off and cracking the glass.

Clamp an undrilled piece of plywood to the back of the glass and dont forget the water running on the hole as your drilling.