Hi Jan...
Here are a couple of links to my frame holder. I realize this does not help you but it can give you some ideas. I do a weaving on this lazy susan with the center part being interchangeable with an eye hook and board to hold down whole chairs. I even have a lift that raises the chairs on the l s and a wedge that tilts cane seats towards me. I work sitting on the couch and the l s with all it's adaptations save my back and legs.
http://weavingrestoration.com/_wsn/page6.htmlhttp://s222.photobucket.com/albums/dd68/klkw1/Everyday I think of a new mechanism to add to the l s to make it even more efficient :-)
Katherine :-)
httP://www.weavingrestoration.com