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The sink has one existing hole, and 3 knockouts which are cut about half way through the material.

What are the best tools, and techniques for removing fixture knockouts on a composite granite sink?

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As brutal as it seems, the prescribed method by FRANKE is to use a blunt ended large punch and a hammer. Set the punch dead center in the cutout and strike it soundly. Don't be too tentative, give it a good shot! Place the punch on the top. If you have a carbide hole saw, pilot a small hole dead center from the side already drilled then finish it off from the top, using the pilot hole.

When I first saw my plumber do this on a kitchen job, I cringed, but it worked well. Weren't there any instructions with your sink? I'm just relating the way FRANKE recommends, maybe your brand has a different method.

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  • So no use for a carbide hole saw? After forking over that kind of cash, I'm tentative to smash it with a hammer. – Tester101 Apr 1 '11 at 13:40
  • Do you place the punch on the top (where the sticker indicating there is a "hole" there), or the bottom (where the partial cutout is visible)? – Tester101 Apr 1 '11 at 13:57
  • the instructions say on the top. . If you already have the saw, then pilot a small hole dead center from the side already drilled then finish it off from the top, using the pilot hole. – shirlock homes Apr 1 '11 at 14:27

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