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If I am reading you right your 5 degrees off which is alot unless the dampener has slipped(happens but is rare). What I do is turn the crank to the 5BTDC mark(approach it slow & dont go backwards) then screw in the stop until I gently but solidly hit the piston then turn the crank CCW & if it hits the stop @ 5ATDC I'm good & if not post what you get



This is really not a good way to do this. The reason is, that anywhere from 10* on down to TDC, the piston moves rather slowly near the top compared to the damper. You are much better off screwing the stop IN (longer) so that the piston is further down. Just make two marks, one for each stop, and TDC is halfway in between. Make a third temporary mark halfway inbetween---the new TRUE TDC, and bring it up to 0 on the pointer. Now you can see where the old mark is in relation to the damper.