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Hi Kev,
What you are referring to is known as a "clearance hole".
The O.D. of a 1/4" thread is 1/4".
If you have a drill press, you could drill out the scope ring threaded mounting holes.
Ideally drill them with a 6.2mm drill bit and then use a 1/4" reamer
to ream them out to exactly 1/4".
But a round file and patience will get you there. Has been known to
work for the occasional escaped prisoner.
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