REFLECTOR: Roll trim mod suggestions

[Don Johnston]

Requesting suggestions from the hive mind...

After hearing all the comments about the stock roll trim slipping, I
decided that I would go another way. When I saw Geoff's solution, I felt it
was perfect.

Except he has a motor with a .25" shaft where mine is 5/16". The pulleys
for the 5/16" shafts are only available in a larger diameter and that
caused interference issues with the aileron torque-tube bellcrank and
cables.

So I decided to go with a system similar to what is in my Cessna. Chains!
Absolutely no slipping with chains. And it works great. Positive motion and
no slipping. In fact, it will pull the spring around the pulley. Which
causes it to derail and get caught in the bellcrank. :-(

I'm wondering if anyone has any suggestions on how to put in a (simple)
motion limiting mechanism. It would have to be on the motor or chain. My
first thought was microswitches that reverse the motor direction. But I
cant' figure out how to trigger the switches.

Don
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