i had no problem running a SHA in the stock location. Just had to trim the idle screw down a little bit, goofy but functional.
that double-nut idea is key, i never even bothered looking past the hardware store. I was able to have some success with the toothed ring washer thingy, but it wasn't on there for very long before it tore up the teeth on the fiber disc.
i could make you one metal motor mount, like mike was talking about, or wait a week or two for me to finish my hard urethane motor mounts.
email if you're interested.