I've inherited an old Scott Bonnar 4-stroke, which has been going like a beauty, but the handle broke off the started cord the last time I started it, and the cord has disappeared somewhere into the guts of the machine. I've removed the bit where the spring is held, but the chord isn't there. It didn't fly off anywhere, so I'm assuming it's somewhere inside the mower: any clues about how to retrieve it so I can either replace or repair it?