I have used double sided foam tape in 1/2A more than once and it worked great. Clean the servo with alchohol then seal and clean the wood and it should stick fine. If you need to take it apart you can pry it off and the foam will probably split before the adhesive lets loose. I've never used it on a larger plane but in my experiences it should work fine at least up thru 40 size. I can't emagine a servo creating more force than it took me to get it loose. The adhesive sticks better and better over time. I think it would be wise to let it sit for a few days before putting it to the test.