As a rule of thumb posted by BlackholeZ on November 23, 2011 at 08:11 PM
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for the o-ring, then measure the injector o-ring groove. "Tight" and "loose" are not adequate ways of determining that you have the right o-ring and the right groove. Had Gordo done that, he would have immediately seen where the o-ring belonged, and confirmed that he had the right o-rings.