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Think outside the box. Make a frame of 1x's about 1/2" larger than your finished frame, with perfect square corners.
Saw up some small wedges that when placed with opposing ends together will force the finished frame together into the corners.... no clamps required.
www.woodmagazine.com
Saw up some small wedges that when placed with opposing ends together will force the finished frame together into the corners.... no clamps required.

Clamping with Wedges
Short on clamps? Use custom-made wedges to draw together glue joints.