I recently purchased a used Felder Combination machine BF6-31 and am just now figuring out how to use some of the shaper accessories. I have what looks like a saw blade but it is in two pieces and has only a center hole. Felder let.04-2-250 250x8/15x30 man hw L-01 n 3000-5000 Does anyone know what it is and how to use it? I am guessing that it might be used to cut tenons if I insert a spacer between the two parts but I don't want to experiment with knowing what it is meant to be used for.I appreciate any advice. Thanks