Ever try to glue a picture frame corner only to have the clamp slide off? This customized spring clamp applies powerful force and stays put while the glue dries. To make it, drill 3/16-in. holes in the jaw tips of a strong spring clamp and, using a couple of 1/8-in. nuts, tighten two 1/8-in. x 1-1/4-in. machine screws in the holes after sharpening the tips on a bench grinder. Yes, this will leave holes in the wood, but you can drive brads in the holes to reinforce the joint, then fill them with putty.