Miter Clamping Tool: https://www.woodpeck.com/mct-miter-cl...
Woodpeckers Miter Clamping Tool directs the pressure straight across the miter joint, pulling the joint together, instead of forcing the 45° miters to slide against each other. The Miter Clamping Tools work with any stock width, from tiny cove molding to the largest picture frame stock.