I have been in the habit of checking everythig on my Z230 before each flight. I physically touch every link and make sure that they are firmly seated. I also check each and every servo for proper movement. After every day of flying I take an allen wrench and check all the allen screws for tightness.

About a mont ago my radio started to have problems in hte elevator, and the cyclic controls, when the radio was turned on they would move, but on a fraction of the actual movement. If I had not gone through my pre-flight inspection like I do, it would have been really bad. The radio was repsired and all is well now.

As far as the screws that hold the control horns on, I have not yet had any of them come loose, but I do not use the standard horn screw. I use the JR output support arms, and these coe with a different screw. I end up having to re-tap the output gears of the Futaba servos, but it is replaced with a metal fine pitch ball that the support link attaches to. I have a good pcture of it on my web site under Helicopter Misc page. these things are great at reducing the shear load put on the servo output gears.

I do not think that you could use loctite since from what I have been told it detriorates the plastic, and super glue would make it hard to remove. But whit I think would work is a little dab of permatex Blue or black RTV gasket maker. This will hold the screw really tight, but also allow for its removal. I always have a tube of it laying around, and you can get it at any Auto parts store. Give that a try it cant hurt.