My motor took a shit on me years ago and I replaced it w/a Fuba off of Ebay. Works great and I have been asked many times, "Is that an s2000 antenna?" Pain in the ass to remove the motor. I would say the likely hood that the worm gear breaks at the tip is probable. It is clipped in to the tip of the inside of the mast and if over fucked it just snaps and then you have a worm gear the is not attached to the inside of the antenna, which in turn will keep the worm gear from pulling the antenna back down.