On Wed, 25 May 2011 21:03:19 -0500, dpb wrote:

On 5/25/2011 8:20 PM, wrote:
...

re-bush one is to take a good one and fixture it on the mill, using an
end-mill, reamer, or transfer punch as a locator, then put the old
carb in the fixture with a larger end mill or reamer, then press in
new bushings and mill/ream back to proper size , again in the fixture.

All of this has one thing in that I've previously mentioned
lacking..."mill"
If you have a "tight" drillpress you can do the same. Cutting zinc is
not terribly hard. The secret is in the "fixturing" to hold the carb
rigidly square to the cutter and accurately in position.