From About This Project
In your haste to finish mowing the lawn and get to the golf course, you mowed right over the plastic lawn edging and mangled it. To make matters worse, you inflicted the damage on a curve. You can’t just splice in a little 12-in. piece—that would create a pointy little bulge. To restore the natural curve, you need to cut back and splice in a longer section of new edging to replace the existing border from the beginning to the end of the curve. NOTE: Use this repair for all types of border edging.
Begin by laying the replacement edging flat in the sun to make it more pliable and relax the curve. Next, make the first saw cut through the old edging at the beginning of the curve. Make just one cut for now. Cut the new edging long enough to extend past the damage and gracefully merge with the existing edging at the end of the curve.
Prepare both ends of the new edging. After the first saw cut, butt the old and new pieces together and secure them with a connecting pin and rivets. Finally, use the new edging as a guide for marking and cutting the old edging, then drill and rivet that joint like the first. (Avoid using a tape measure to measure the length for the new section because a metal tape can’t accurately follow a curve.)
If necessary, pound spikes through the anchoring flange and into the ground to hold the edging in place.
Now grab those golf clubs and GO!