Does anyone happen to know the correct moment arm for the aft wing inspection panels in which the strobe power packs are mounted for a 201? The Service Manual (Fig. 6-3) shows the spar should be STA 53.00, and the aft of the wing at the fuselage is approx. STA 88.00, but since the wing tapers you can't go by that. Failing any other solution I suppose one would take off the panel and measure from the midpoint of the opening to the spar, but I thought perhaps one of the resident Mooney savants might know this offhand and save me the trouble.