MINE DID THE SAME THING, CHECK UNDER UNIT, THEY ADD SOME TYPE OF SPRING ON THE DRUM FOR SHIPPING CHECK TO SEE IF YOUR ARE STILL INSTALLED. LOOKED LIKE THERE THERE TO HOLD DRUM IN PLACE DURING SHIPPING. AGAIN UNDER UNIT, MIGHT EVEN BE LABLED TO REMOVE GOOD LUCK IT WAS OVER 3YR NOW, STILL REMBER THAT NOISE -BOOM,BOOM............
JOEALARM, August 2007