Why use so much weight when joining the top. The pressure required to clamp tops/backs together is pressure from the sides. An "old fashioned" way to do this is with a series of 2 wedges each along one edge, the other edge is blocked off. The weight on top only serves to keep the wood plates from buckling and lifting up, they will do nothing to improve the glue joint.
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Ned Milburn
NSDCC Master Artisan
Dartmouth, Nova Scotia
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