The results from using this are absolutely remarkable for me. Dramatically less vibration, noise, scratching, and thus sanding, are worth the minimal cost. Instructions say to clean blade, arbor, arbor backing, and stabilizer with solvent and to stone away any burrs that might be on blade or arbor so you get a really clean, tight mating of all surfaces. Works impressively well, in my experience and still allows me a 2-1/4" cut above the throat plate. This is on what I thought to be a pretty well-tuned saw, too - exposing some adjustment needed to make the fence more parallel and that I had the miter slots nailed.