No one with a modicum of mechanical knowledge would argue with that & if I were to do this it I would do as Cobber has recommended.
It was a mistake to make that comment as it trivialises the work involved & could have been seen as an invitation to the less skilled to rive at it with an inadequate drill shod with a blunt bit.
Besides there will be few dual standard wheels with which to use as a pattern.
Sorry folks, I should have thought that through.
M

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