Repair broken tracks with wire and solder.
On Upcraft.it, MAKE pal Andrew Lewis shares some tips and tricks for repairing switches.
With this switch, I was able to reposition the broken corner of the board and glue it back into place with epoxy. A close examination of the copper tracks on the circuit board showed that one or two breaks had occurred as a result of the cracked PCB. I repaired the cracks by removing varnish with a fiberglass pencil and soldering a piece of wire across the broken section of track.