Lets say I have a 50mm (1.9685 inches) obj with 35mm tube and .95" rings and i have .10" clearance from obj and barrel. If I change to 56mm (2.2047 inches) with 34mm tube, do I need rings that are 3mm (.1181) inches higher to have the exact same clearance? Is my math right? 56-50 = 6mm. 6mm/2...