Why complicate it, indeed. There is no 1/16th stop obviously, but for the sake of "anality" how accurate does it have to be? ;-) In this example, completed repair at BV 6 is one needle thickness off center (and exactly where IS the EXACT center mark in the OM-1 meter display?) There isn't one, so I estimated "how close is this to zero on this $5000 Kyoritsu EF5000 shutter tester? Crap, it's a needle thickness, let's say 1/16th stop" The "error" is so minute it just doesn't matter. I've been servicing OM for 34 years, and in the 15 years using this 1N-6263 conversion with silver oxide battery, not one complaint regarding "accuracy". John