Castor proofing external servos

Castor is my good friend that I do not welcome everywhere, though.
I built my Lil' Spee-Dee with its aileron servo sitting on the top of the wing center, where the 010 Tee Dee will spit a good stream of castor that, if enters the servo near its output shaft stem, will sooner or later kill the electronics inside, or stick the plastic gears together.

I cut the bottom corner of a plastic bottle originally containing textile rinser fluid , and fixed it with the servo arm screw such that its skirt hangs down below the servo output shaft housing. Streamlining the servo area a bit, it will hopefully divert castor laden exhaust gases from the vulnerable electronics, too..
Admittedly not comparable to the invention of dynamo, the repurposing idea may still help others protecting a servo placed right in the trail of oily exhaust streams.