My bad I guess. Thought you were going to call me...........but yes, did find solution. Turns out (at least according to Oneway) that the 20" swing tubes that I have now are an older style that they changed somewhere along the line and won't fit to the newer style knife & support posts. Ordered the new tubes. Figured it was cheaper and faster to get them versus driving up & back to Dave Betler's house and modifying the original 24" swing tubes.
Dave, you never called back did you find your answer on the oneway coring question?