The hole problem...

[Donn2390]

 I had granite counter tops installed a few months ago. Today's project is replacing my old hot water dispenser. Same brand of dispenser, the countertop hole is ever so sightly too small for the new dispenser. We are talking an extremely tiny amount of difference.
 Question, what is the best way to enlarge the hole...? Will a rat tail file do anything with granite? Go to HD and buy a carbide file....?
 Save my marriage, give me a good answer...! 
                                 Thanks...

[Rick Crowe]

                          The easyest way is to drill the hole the next size larger . If that is not to big for the cover.

[Mark D.]

What Rick said...just get the correct size diamond core bit and have at it. How big of a hole do you need and what size is the flange?

Mark

[Donn2390]

 I went to HD to see if they had a carbide stone or drums. After having three guys in the tool department assure me they had nothing that would help me, I went ten feet past them, same isle, and found a Rotozip diamond cutting tool just for such uses.
 They were darned proud of it... $40. bucks..! What to do with a $40 dollar, once in a lifetime use tool?  I've decided to make a necklace for my wife, she's always wanted a diamond necklace..!
 When I got home, I discovered it had a different sized collet than my Rotozip has. So I call Rotozip factory.....  "Oh, you have the old model, we don't make that anymore..!  We will send you the correct collet, should arrive in four days..!"
 So I'm using my new diamond with my cordless drill. Not nearly enough RPM, but I have four days to kill until my collet arrives...!
 It's working, slowly, I'm almost there. Had to stop for a battery charge.
 As far as drilling out to the next size up, you can't drill without a pilot hole, so that option is out....

[Mark D.]

You CAN drill without a pilot hole....simply drill a hole through a piece of wood, hold it in place and use it as a template for the core drill. Piece of cake!

Mark