Chuck, I designed a fairly simple electric aileron trim for my 235 that puts the servo in the wing rather than the aileron itself to preclude the necessity for adding more balance weight to make up for the servo weight. The design eliminates (or at least minimizes trim input with aileron movement). The servo is mounted on the inside top of the wing skin thru the aileron bell-crank inspection hole so no other access panels are required.

It has worked flawlessly for me for the 14 years my airplane has been flying. If you wish, you can contact me off-line at: dfs155@roadrunner.com for pics and write-up.

Dan Schaefer
Early LNC2   N235SP