The answers are all in the old Yahoo Group. We made a video for Sharon using a slatted and non-slatted aframe in the facility that we moved into in 2000 to demonstrate how dogs avoided the slats when they were running down the aframe. Slats were definitely allowed in the 90's, I have a picture of the aframe behind me from a trial in 1996 or 97. There was a table, a chute, a tire and a teeter in the ring, too, I still have the VHS videos.