Don't rely on them to keep something at 90 degrees. They're more for general positioning.
The aluminum ones are a better bet for accuracy.
Chris
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16 years ago
Expensive Corner Clamps
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16 years ago
Rockler
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and similar ones elsewhere. They look like a great idea but I think
I bought two of them years ago. Nice heavy duty gizmos. For them to work halfway decent you have to have one on every corner. The clamping pressure is very limited in area. They are not worth the money they cost.
Roy