I have a UCD .60 and have had it up once. Someone told me I need stronger control linkages so I put 4-40's with metal clevis', swivel ball links, stronger servo arms, and soldered on threaded couplers to connect to the swivel ball links. Look really tough, but, I noticed when I turned on my radio with my high torque servos.. that.. if i kind of flipped the rudder it was shake.. BAD!! it would not stop for like 20 seconds. I then reached up and flipped it with my hand.. I could tell there was quite a bit of play. Looked like it was mostly in the screw on clevis, but, I don't know what to do. I have the thread all the way through plus some. I did put it on the far outside of the servo arm and 2nd from the outside of the horn. I need to do something like this b/c I want to be able to do the throws as far as they will go when on high rates. Are there any tricks to installing metal clevis' that I am unaware of? Anybody have any ideas on how to keep this from happening. I am no expert, but, can imagine that shaking like that in the air would tear the plane apart.