RE: Viper vibration problems
Ways to fix a buzzing racing aileron assuming servo and linkage are AOK:
1) - Tape hinge bottom with 3M clear 200 MPH tape. This will often cure it.
2) - Tape the outside corner with clear 3M 200 MPH tape.
3) - Strip covering off top and bottom... soak with thin CA in a zig/zag pattern.
4) - Strip covering off top and bottom... use thin CA and 3/4 oz FG to strengthen aileron.
Start at 1 and work your way down... you probably won't get by 2 without curing the flutter. Good luck