Second, Wrap Tape from Front around Back

Again with scissors, cut another piece of copper foil tape 1 1/4” long, carefully remove the backing. Begin near the gap and wrap the tape carefully around on the back following the lines as you go. Try to make the gap on the front exactly the same width as shown. The tape may not quite extend all the way across the back.

Use the switch piece edge of the to smooth both pieces of tape until they are securely stuck down flat - especially along the edges of the gap. Wrinkles around the gap should be completely flat and none of the edges should stick up or they will interfere with the switch operation.