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Fuselage leveling laterally

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MattL

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According to the manual:
Laterally: Using a level 30 inches long, place it across the center of the rear seat with the ends resting on the longerons. Due to the right upper longeron being 1/8 inch lower than the left, a 1/8 inch block is used under the right end of the level. Adjust the blocks under the landing gear fittings to bring the bubble to the center.
To me, this is as clear as mud.
30 inch level will not fit across cockpit. I can see that my right upper longeron is lower than the left. Don't really see what the seat has to do with the upper longerons. Place the block under the right side of the level.
My interpretation, looking into the cockpit, looking up and aft, place a 1/8 block under the right side of the level. Which would be the upper left longeron, positioning the level above the center of the rear seat. Level the aircraft. Agree or disagree that is the question. If you disagree straighten me out, please.
Thanks
 

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