For some time I have tried to locate PVC quilting frame clamps. My husband was such a sweet heart to build me a PVC quilting frame, and we found two clamps that fit nicely over those PVC tubes. We were lucky to find the two tension adjusting clamps that fit, from Hobby Lobby. I would like more, but can only find the smaller size (width around or in diameter). Every website that I go into looks like it has the narrow PVC pipe. Thanks in advance, any help would be greatly appreciated.