Doug Brown posted for all of us...
"RicodJour" wrote in message
news:cd4e801d-b05e-485c-8fee-
This is the standard way of enlarging a hole. I use scrap 3/4"
plywood as it's less likely to create problems of depth, you can use
the ubiquitous 1 1/4" drywall screws to attach it, and the plywood
won't split with repeated use.
R
Or our friends at Lee Valley have this:
http://www.leevalley.com/wood/page.a...at=1,180,42316
Mads by Starrett I believe.
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Tekkie Don't bother to thank me, I do this as a public service.