My new longarm has a much bigger quilting space than my previous machine did, but my old side clamps that I had made worked fine, so I decided it was fine to continue using them. Main thing I did not like about these clamps is it required pinning the fabric to the backing... that is 7 big hat pins on each end that often left me with a pricked finger. In a forum for my Innova there was talk about side clamps with a couple suggestions. I took the info and came up with my version. The main item I needed to purchase was this Quilt 'n Go lap frame that I bought at JoAnn's. This kit would not make a clamp that was long enough, so I bought a longer CPVC pipe to cut into two - 21" pieces.
The key part is the snap-on clamp that holds the fabric to the pipe. These snap-on clamps are only 9.5" long, so two on each pipe works great. I ran bungee cord through the pipe and attached it to the side of the frame. The picture shows elbows on the end of the pipe, but I'm thinking they really are not necessary. They can easily be removed. Also, once I have some experience with these, I may determine that the pipe does not need to be quite as long. Easier to make something shorter than longer. I have not actually loaded a quilt to try these out, but the backing appears to be nice and snug. You can see my previous fabric side clamp with the pins on the table. I will hold onto them... for a little while anyhow.