RE: Single servo glitch with engine running
I had a very similar problem a couple of years ago it took me a month to get fixed.
how is your antenna routed out of the plane?
does it wrap around any servo leads or push rods.
mine was ran under the fuse and held tight with a rubber band attached to the tail wheel mount ( plastic) moving the anntena out the top of the fuse and mounting it to the vertical stab fixed the problem.
you might also try twisting your servo lead about 3 twist per inch sometimes helps.
Is your tail wheel hub metal or plastic I have seen that cause problems as well.
Good luck.
WYLDMAN