your emergency shut off switch is assembled the same way...don't ask me how I know this...the little F'n ball bearing rides up over a slight lip(compressing the spring) then drops into a small valley on either side (off/on) holding the switch into position....also next time if you dissasemble it and all the parts "sproing" around the garage...if you sweep the floor three times into a pile then go thru it you WILL find them....
