I haven't gone thru a RTR X1 yet, but I still may be able to help a little.
I would assume two washers, if in a glow plug that came in the kit, may be for the plug if used in an O.S. engine, which takes a shorter plug, requiring two washers....or for a replacement of a worn one in the future.
The roto start should work well enough, as long as the engine isn't hydro locked, from flooding, while trying to turn it over. If it is already damaged have your local shop(or where you bought the kit) order a new bearing, parts are available seperatly. The other option is a starter box, which is the best method.
Good luck, Jim