Frank10;

No problem.
1st rub your finger or thumb across the grey mount and on the wing. Remove the rubbery stuff....
Use clear double sided carpet tape and it will go right back on. The flat on the mount is sometimes cupped. It can be sanded or filed flat or use more than 1 layer of the clear tape so you get full contact.
They make a white foam carpet tape. It doesn't hold. Go with the clear.

Tony
ARS Software & Innovative Solutions
http://www.falcon1.net/~ars/rcmodels.html