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Email reply:
Hi Glen
There are two four corner clamps available that are good ones. One that uses threaded rod and one with an X setup.
I used to use one of the threaded rod type in our frame shop whenever I had a real large frame to build. Once a Chinese restaurant wanted several heavy frames made that were three feet by six feet and I used 2x4's as a base. I couldn't find threaded rod long enough for the six foot side, so I just bought blank round rod and threaded it myself. Those are real handy and versatile clamps. The pictures are still hanging straight as can be 15 years later.
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