thanks for yeralls input, and I think the solution is to machine the cleanout cap down 3/16" and weld a peice of sheet aluminum to the cap. I spoke with JBP Tom and he seemed to think there is nothing wrong with this method. The pic of an inset box fabbed to allow the cleanout to still be functional in my case is a little beyond the skilz of a homebuilder, but supersweet at the same time. I Emaild Ray Black regarding you guys sending pithy sarcastic responces SO BRING IT ! Im pretty sure Ray's screen name is IRREBEL. Oh yeah, the pics are on the post "...basketcase ... third times a charm"