I bought a Fields type M damper. It is of nice quality, and performs well. I did install it in a 22 guage T and had to tweek it due to the tight constraints of the thicker T. I have been pleased with it. Just be we willing to bend or tweek the metal so that there are no obstructions to compromise its performance. I had the RC damper and was not pleased with the brad nails as bearings for the pivot of the damper. I am just a freak for details because I cannot help myself.