Center section, see were T is cut out so you can lift up and put roll of freezer paper on. Also the spring loaded bolts with wing nuts for tension and to keep from over tightening the PVC pipe.



Same with the top.
As for the base you can see mine is PVC but I have a few boards on it, will end up making another out of angle iron or regular pipe in the future for better stabilization on breezy days, But then this one is 11 years old and I have not got around to it yet . Dont glue the base to it if you use PVC, so you can take it apart for easy storage.