here's a website a guy made with the fix:
http://www.deerslayer.freewebspace.com/dropzone.html

another possibility is the screws on top and bottom of the launcher arm assembly may need a little tightening. but if you overtighten you can damage the teflon tubes inside. something that also causes noise is if those teflon tubes are damaged. if they are TR will send you some new ones pronto. the screws on top and bottom i mentioned seemed to loosen up on me so when i did the fix from the website i put a little threadlock on bottom of the super long screws that go from top to bottom of the launcher arm assembly. it's quiet now. also, i've noticed that when center shot is set properly for my shooting form and i have proper vane clearance its a lot quieter than when its off.
oop, oh yeah, i have the one with the dampeners over the mounting bolt, and i put a piece of felt under the dampeners so the metal disks in them wouldn't vibrate against the mounting bolt.