Greg: When the .750 diameter 6 pin on a 4.25 bolt circle was done on my PSE FIA wheels a few years ago with the Trigo adapters, 49/64 was the drill bit that was used to drill the holes in the wheels. Like it or not when you go to slip the wheels on there has to be a small amount of clearance to allow all of the pins to slip into the holes at the same time. This application is not a true precision fit situation. Here is a picture of the hub with pins installed. The 1/64 (+-.015) tolerance on a non solid 26 inch diameter tire will never be felt.
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