Take the rest apart. The bottom of the housing where the arm is attached to the 2 posts can be seen. Place a piece of moleskin or thick felt between where the two screws pass thru the bottom of the housing. You will want to make sure this sticks firmly so that it will not come up and interfere with the operation of the rest when the arm drops. Next, take another set of rubber O-rings the same size as the factory ones on the screws and add them to the screws.(You should then have 2 O-rings on each screw. Put the rest back together. Now, take a piece of the same felt or moleskin (I prefer the thicker felt. Can be purchased in the craft dept at Wally World) and cut a piece long enough and wide enough to stick to the sides of the rest in the slot where the drop bar falls. Stick this in there securely so that it does not actually touch the drop bar, but sets just a hair under it. When the drop falls, the force will allow it to hit the felt. This made my rest so quiet, I can now hear nothing but my release click when I shoot.

By the way, this is the guide series and it does have the harmonic dampener which also helps.

LT