Antenna noise/grinding...not antenna mast...HELP!!!
 

I recent purchased a new antenna mast because I began to hear that grinding noise it would typically make if the mast was broken. When I installed the new one, it continues to make that awfull noise when the antenna is all the way up. I took the antenna motor apart and removed all broken pieces of the old mast already. I understand that this noise is caused by worn out teeth or broken piece of the mast. Since this is a new antenna mast with unworn teeth, could the teeth on the motor be worn? Any help or advice would be great! THANKS!