This is a great thread. There is a lot of good information here. I never thought about using a spacer as Minnflyer and RCKen suggested, but very practical and a good engineering practice.

I use the rubber grommets for all except for the servos that are hot-glued into the foam fuselage or wing on the electric powered planes. Anything that is glow powered has grommets and the brass metal collars. The only plane that I have that has the sideways mounted servos has plenty of spacing between the bed and the servo. But, for future applications, I will surely use the spacer.

Now, I gotta look up that tape Gray Beard suggests. Sounds like some tough stuff!!!

CGr