To keep the electronic free of “Nitro Slime”, I open them and put Lectrostik Wax inside. I liquefy it with a heat gun and drop by drop I fill the electric part of the servo. until is full, screw back the cap will it get solid again.. Its melt at 175C and is keep a kind of elasticity / sticky when dry. Add “O” ring from the plumber store and Voila. . It WATER PROOF if you do it right.
Check my videos!
http://www.youtube.com/watch?v=sIB6jLtTs0k
http://www.youtube.com/watch?v=P1bFK-l0VQ4
See Yaa!
Frank_514