The switches will disassemble by carefully prying apart the components. You need to scrape the inside contacts as oxidation occurs in all, and burning on the switches that are used most often. There are guide grooves and slots that aid in reassembling them correctly. Inside the switches you'll find two springs (they sit in a built in tube) putting pressure on two bb's which in turn press against two stamped metal switching plates with contacts built in and those in then touch the switch contacts. When reassembling the switches use a little glob of grease to hold each component in place.