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The problem is that in their unrestrained state piston rings ‘aint round!

This is because the ring is split and because of that a truly round ring would not exert an equal pressure on the bore when in place. To counter this rings are made to a shape, when relaxed, approximating to that of a halved apple, a shape that evens out the radial pressure all around the bore when fitted.

The simple answer would be to make several pieces of sheet steel with holes in them matching the standard bore and the usual oversizes. The rings could then be inserted, largest hole first, until the best fit is found when held up to a strong light.