I was thinking about this today, and persionally how I would add for the longer threaded part, would be to add a threaded stud on the end of it. It would screw onto the stock motor mount studs, and then have a bolt hole on the other end, then instead of using a nut to attach the mount to the bracket, you would use a high quality bolt.

Think of it like a "peg" we used to all run back in the day on our BMX bikes so we could haul our friends around on the back. But smaller of course.

~F~