1 Purchase some medium fine grade sandpaper from your local hardware store
2 tear off a 4 square cm section and roll it into a tight tube\ vagina straw, just wide enough to fit over the stem.
3 carefully and gently rotate the vagina straw onto the stem ensuring a tight fit.. you may find the internal edge tries to dog ear over but just be persistent and carefully roll it on
4 begin a circular rotating motion, back and forth, depending of the grit of the sandpaper this may take several go's.. be patient and dont take too much off or you will expose the internal structure and it will be botched !
5 Keep trying it back on switch every 2 or 3 sandings and you will find it will stop biting the edge.
6 IMPORTANT - Wash and dry the keycap each time you try it back on the switch or you will dump plastic powder down into the switch mechanism..
