Using Cauls and Playing Cards for Even Clamp Pressure

George Vondriska teaches you a neat little trick for creating tighter biscuit joints on your shelving. After filling them with glue and inserting the biscuits into their slots, he places two playing cards between the case side of the shelf and a wooden caul to ensure adequate pressure in the right places. This will allow the glue to dry uniformly and seamlessly across the entire edge of the shelf.