That's the point. You shouldn't have to change anything once the cylinder measurement is set. Screw it in to the cylinder depth and remove and place the opposite end against the booster. A properly adjusted gauge should be already there with correction built in or at the least, the two should be the same lengths so you could use a feeler gauge. By having a difference already in the tool or having to make a correction after it is set, it introduces a variable.
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