I just got my new 1.20 Yak 54 in the air for the first time last Friday and was checking it out today for loose bolts, etc., when I found that both elevator servo arms have "play" in them. I thought it might have been the arms loose on the servo shaft, but new arms have just as much movement (about 1/64" or so at the rod connection). This suggests it is in the gear train of the servos. The servos are Hitec 5645MG's. The same type servos on the ailerons don't seem to have the "play". During the one flight I heard a buzz that might have been flutter, but couldn't pinpoint it and it wasn't where I could identify the flight regime when it was happening. Has anyone else experienced this on this airplane? I have the gaps sealed as per the model's instructions.

First question, if it is flutter, what can be done to eliminate it? I was thinking of some counter-weight in the outer elevators where they extend forward of the hinge line, but the CG is marginal already and I don't want to make that a problem. Second, have I already ruined these expensive servos? How do I check them? Is the gear train replaceable (by me)? Comments and suggestions welcome!