Protect your workpiece surfaces or edges from marring by rough vise or clamp jaws
Too much pressure on the jaws of your vise or clamps could easily mar the surfaces or edges of your projects during glue-up. That's why experienced woodworkers suggest that you use wooden cauls to protect your projects during glue-up.
Great idea…but how do you hold the cauls in position while you apply the necessary pressure? If your vise or clamps have rough or uneven jaws made of ferrous (magnetic) metal, try using "refrigerator magnets", like those you get from your physicians, pharmacies or other types of advertisers. Just adhere them temporarily to your vise or clamp jaws during glue-ups.