Thanks in advance for any comments/help. I'm determined to try a mortising attachment on my new Porter Cable 15". I can't find a PC mortising attachment for it and the other kits I find do not have the bushing for 47mm that I need. Is "close enough" on the bushing ok? I believe the Delta kit comes with a 48mm bushing. Will that work? Several kits mentioned that they come with different size bushings and to use the one closest to the size of the quill. Do the bushings flex at all or have some leeway on size? I see mention of a Porter Cable attachment in various places but darned if I can find one for sale anywhere. Some are listed as "universal" as well.....