If the faucet is a 4" center-set, only the two outside holes need to be 1-3/8. If a wide spread, then all three.

It's time consuming, but LOWES sells a sanding tool designed to sand the inside of holes that fits a regular drill chuck and various grit discs.

Sorry, double post

This post was edited by brownnugen on Sun, Mar 23, 14 at 22:40

More iike 30min and two or three coarse disks.

The hole saws are generally an abrasive unless a masonry bit and that size would need a SDS roto-hammer. The abrasive bit has a 1/4 masonry bit as a pilot and would need a wood dowel to be inserted in the hole to prevent wander.

I tried looking for the sanding kit you were referring to on Lowe's website but couldn't find it. Do you have a link to it?

While I was searching, I saw this hole saw kit (search for "Blue Hawk Diamond Hole Saw Kit"

Would that work for what I need to do?

Here is a link that might be useful: Blue Hawk Diamond Hole Saw Kit

This post was edited by brownnugen on Mon, Mar 24, 14 at 5:27

That kit is as I described and requires a dowel be placed the hole for the pilot.

Re: LOWES; I purchase mine last week, however, it's a common tool sold at ACE, TRUE VALUE and MENARDS as well.

This is what the attachment looks like, however, those at the venders I listed will vary and keep in mind, this is a professional kit, not a homeowners: http://www.woodcraft.com/Product/2000276/427/Sanding-Set-12-piece.aspx

IMO you need to grind that hole larger - you are only talking about 1/16" around the circumfrence.

Even if you plug the existing hole (so the drill will center) the difference in the hardness of the wood and granite, will cause the hole saw to wander to one side or another.