Making a wiggly line with your router is the key to keeping a piece of drywall from slipping before it's fully cut.
Whenever I used to rout drywall for a door or window opening, the piece I was cutting always fell before I could get to the end of the cut, tearing the drywall and sometimes hurting my toes. To prevent this, I now leave a little knob sticking out in the piece I am cutting. The piece won’t fall because the knob holds it there. Once the waste piece and my router are safely on the floor, I cut off the knob with a utility knife.
—Ricardo Martino, Ghent, N.Y.
Edited and Illustrated by Charles Miller
From Fine Homebuilding #281