When you need an unobtrusive, super-strong hold for a joint before screwing, use a C-clamp or handscrew clamp. I use these on mitered corners and face frames, where it's important to maintain a ...

[ThingaUser] made a tool to solve a specific problem of theirs, but the design also happens to be a pretty good way to turn a c-clamp into a poor man’s light duty arbor press. The frame is made ...