Trim it level with the longeron top surface
I think this anomaly dates from the time when F-410 and F-410-A were co-located.
Drawing 30 seemed to me to indicate that F410 had to end flush with the top of the longerons. There is a piece of 1"X1"X1/8" angle that runs across, carefully fettled to fit between the longerons and below the top flange, a 1/8" spacer to bring this crosspiece up level with the longeron top and then F-419 over the top of that assembly.
Before fitting these parts, check your HS for the distance from front of rear spar to the midpoint of the attach angle on the front spar in case you need a spacer on the front of F-410.
The conjunction of the cross piece and longerons is where the HS attaches - a place for careful measurement and drilling.
There's a recent post on what to do if the HS attach holes are too far inboard with a horrible example of how it looks when it all goes wrong. It's worth remembering tho, that that particular example flew 700 hours with lots of energetic aerobatics (Lomcovac anyone?!). But everything stayed attached!
Hope that all helps.
Chris
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Chris Mitchell
Repeat offender;
RV-8, QB, built, flown 150 hours, sold;
RV-4 - attempted repair, rebuild and remediation - abandoned and junked   ;
RV-4 fuselage and wing kits - both at QB stage;
2015-2018 dues paid!
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