My faucet recently broke, so I replaced it with a new faucet and sprayer. To put in the sprayer, we removed the dishwasher air gap - with predictable results. I've replaced the air gap in its hole. I'd still like to use the sprayer; however, I don't have any other holes of the right size.
I do have a 1/2" hole on the other side of the porcelain sink that was previously used for a filtered water faucet. How can I widen this hole to the 1-3/8" that I'll need for the sprayer?