I have an 05 Allegiance, that I recently changed cams for a longer draw length. When I went to add the new cams I used the same washersfrom the older cam, set everything up and went to shoot it, after the first shot I heard this buzz (vibration) so afterexamining the bow it was comming from the camsthe spacers were vibrating after the shot and I could move the cams left and right. I contacted Bowtech and explained the problem, they said I needed new spacers which they sent me. When I received the spacers which some were thin and some were thicker, after installing the spacers my problem was resolved. As far as the customer service Bowtechdid a awsome job, they could of just told me to take it to a dealer but I agree with some of the response to this thread, why buy a $750 bow and have to add spacers to it.Some people have had some bad experiences with Bowtech but they sure make a sweet shooting bow.