Can anyone tell me of places where I might actually purchase a new idler for the SMGT. You know the sort of shop that might actually have the part in stock and would be able to post it to me for a small donation to their revenue stream. My google-fu appears weak and it doesn't appear to be the sort of item that any self-respecting shop would actually carry.
Preferably based upon a cog (see terracycles design, and how many teeth should I be looking for?) rather than nylon rollers.