I am also new to jets and am using the 8711's in my hornet , I wet thru 6 new 8711's til I found 2 that was acceptable for my elevetors , I sent one of the worst ones back cause of excessive play . The slop was in the shaft not the gear train , I have absolutely no slop in linkage , I proved that some of the servos have more play than the others. The slop in the one I sent back was over 1/4 inch at rear of the stab . That's just my experience with them . I will definately use them in my jet anyway . Bill