Here's a cute trick for clamping acute angles

Guessing how far the spring clamp would fly as it popped off the end of an acute-angle glue-up was almost becoming a game in my shop. Then I found that I could get better clamping (although less entertainment) by wrapping a strip of cloth-backed abrasive around the clamp tips.

To keep the strip in place, I slid the resilient tip cover off the clamp and folded one end of a strip of abrasive over the clamp tip, abrasive side facing the clamp. Then I slid the cover back onto the clamp and folded the abrasive strip back around the clamp—rough side out, as shown, and up the other side. I taped the free end to the clamp to keep the strip tight.
—Erv Roberts, Des Moines, Iowa