We have an RV-8A here that we did the elevator spar service bulletin on to reinforce around one of the hinges where a crack developed.
Unfortunately we cannot figure how the servo is attached when re-assembling the elevator. The guy that removed the elevator is not here. So on with the questions:
The servo appears to be a Ray Allen 8A servo (gold colored part marking label is covered). This servo has a threaded rod sticking out of the thick end where a Heim joint attached through the spar itself. This is also the opposite end of the servo from where it actuates the trim tab (on right side of first photo below). Here are some photos:
The curious thing is that the Heim ball end doesn't appear to be connected to anything. So we are not sure there might be something missing here. It's as if the Heim joint was either abandoned at an earlier time or is missing a link.
Here is a shot of the cove where the trim servo attaches:
There is some protective rubber material around the base of the Heim where it passes through the spar:
Here is a photo of the Heim poking out of the front spar of the elevator:
Any insight into this configuration along with the theory behind having the threaded rod protruding from the servo would be very helpful.