cool - thanks. Will check mine out!It's not a tool. It is a spare spark plug insulator, just as the kit contains spare spark plugs, lights, and fuses. Pull one of the insulators off a spark plug and determine which style you have and then get a spare like it.
Turns out, I am also missing the 12-13 closed (I have an open and closed 8-10, which it seems the open 8-10 is not correct??).I have a bunch of these and the one pictured is for a later motor as it appears to be the flexible type.