Have a few questions, as I am finishing up my LT-40 taildragger conversion. The Du-bro tail assembly I am using, the control horn that is inside the fuse (which the wheel axed goes up through) has a small set screw on it to connect the control horn to the axel. The control horn (I assume) is nylon, and the set screw is steel. After getting the set screw engaged, what can I use to lock it in place to keep it from vibrating out? I read my GP Thread lock bottle, and it indicates to NOT USE on plastic. I have no idea of the effect. What should I use? CA?

Also, my rudder servo, when you look directly down at it, it seems to be askew by like 5 degrees. Everything works good, but the control horn just does not seem to be totally paralell. I cannot figure out any way to adjust it by that little bit it is out. Do I just live with it?

Everyone's help is appreciated.

Here is a way to hook up a tail wheel with no set screws

Set screws in a nylon arm won't need any thread locker, they won't vibrate loose. As far as your rudder servo arm, if you can't get the splines to line up so it's centered you'll have to use the trim on your radio. If you have a computer radio it's no problem, just get the arm centered and save the setting so you can move the trim button back to center. If you don't have a computer radio you might have to live with the arm being a bit off as you don't want the trim button to be so far from center that you're almost out of adjustment travel.

don't now how to fix the servo but take the round servo (arm?)
& rotate it to where you can drill holes where you need them--
then saw off edges until it looks like a sero arm.

A standard servo wheel with 6 arms is designed so that each arm will rest in a different position. Look at the base of each arm. there is a number from 1 to 6. By rotating the star to a different arm, you will change the position of the arm.