I cannibalized an old Sims’ Mini S-coil and installed it as a string stopper for a test.
Not only does it eliminate forearm slap, it visibly improved group size about 15%.
I served my string about an inch above and below the contact area of the elastomer “button”.
Sound levels are low to begin with on the ‘07 Truth. The addition of the string stop changed the noise type but not the amplitude. Less of a long twang and more of a short buzz now.
There is now a noticeable vibration in the grip (the rear stabilizer hole is directly beneath the grip in the standard location). Consequently, all that energy is transmitted into the base of the grip instead of being dissipated by the multiple vibrations of the string.
When I wear out the S-Coil, I will shop for a rear mounted replacement, probably a Sims.
Good Shooting!