Its a Corona 120 electric-
gyro= gy401
tx = futaba t6xh


problem is- my tail is out of control- and when i try to correct it via the tx, it flies in the new direction... There is no middle point, tail swings fast in one direction or the other.. I tired unplugging the gyro and the same thing is happeneing.. Anyone know where i can start to trouble shoot this?? i have checked to make sure the set skrews were tight on the gear- and used lock tite.... any help is GREATLY appreciated!!!

thanks in advance!