There is a hole drill arbor that holds two different hole saws. You put a
smaller hole saw on that just fits the old hole and a bigger hole saw that
is the correct size. The small hole saw acts as a guide for the big saw.
It is made by Starret and McFeely's carries it as part #HS-0019. They say:
It could happen to anyone, but it happened to you. You relied on bad
information, and are now staring at a 1-1/2" hole where a 1-3/4" hole is
supposed to be. Now you can fix such vexations. Simply screw the hole saw
for the existing hole onto the "OOPS" arbor (it accepts both 1/2" and 5/8"
threaded cutters), screw the correct hole saw onto the pin-lock arbor, then
place the "OOPS" arbor in the pilot drill hole. For the system to work, the
inside and outside hole saws must have a size difference of at least 3/16".
Perfect when installing new door lock hardware, or when enlarging holes for
new piping in an old house. (Hole saw blades not included). Made in USA.

If you do not have a 3/16" difference you can use a router an a rabetting
bit. Put the correct ball bearing on your rabettting bit and make a cut
about halfway through the door. If the old hole is 1" and you need a 1 1/4"
hole, you would make an 1.8" rabbet around the hole. Then swap in a pattern
cutting bit and use the newly cut rabbet as a guide to finish the rest of
the cut.

Clear as MUD???


--
David Chamberlain



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thony" wrote in message
...
Guys, help me out on this....

I have an older home where all the door knobs are tarnished badly. So,
I've
decided to replace them with new ones. The problem is the old holes on
the
doors are too small to accept the new knob fixtures. Any suggestions to
achieve a professional result?

thanks,
Anthony