Interesting idea, but the real starter cone only costs 7 bucks. If you attach a bolt to it with a nut and two star washers and tighten it good, it won't slip. Actually, I've done it without the star washers and it didn't slip.

By "prepare yourself for starting the engine", I only meant round up the stuff to do so. But once again the warning though, it will cut your fingers right off if you're not careful. Always have someone else helping when you start the engine to hold the plane and assist.

AV8TOR