Based on Tom's answer above, I may have misunderstood the issue.
It looked like the issue was the sides of the nuts were too close to the side of the carburetor, in which case my solution would work well.
If, as Tom suggested, a mounting gasket of incorrect thickness is being used, easy solution; use the proper gasket.
As far as the lathe is concerned; I have several that are portable.
Other than a set of wrenches, screwdrivers, and pliers; a small machine lathe, and a small milling machine (doubles as a drill press) are difficult to do without; and they are NOT expensive.
A few years ago, I was restoring a 100-year old lamp, and needed a pair of brass number 2 by 56 thread screws 7/8 inch in length. Talk about unobtainium! Took about 10 minutes on the lathe to fabricate perfect reproductions.
Jon
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"Good carburetion is fuelish hot air". 
"The most expensive carburetor is the wrong one given to you by your neighbor".
If you truly believe that "one size fits all" try walking a mile in your spouse's shoes!
Owner of The Carburetor Shop, LLC (of Missouri).
Current caretaker of the remains of Stromberg Caburetor, and custodian of the existing Carter and Kingston carburetor drawings.
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