I was more thinking about reproduction parts to refresh existing machines. Maybe improving the quality of the gears so taht they don't wear so quickly and break teeth. Given the quantities, I don't think it would be something to make money on, but to just be able to get the parts and keep these machines working. Availability of a new machine would be nice, but same problem as above. Limited run and expensive tooling to make it nice like the Boss or the MF. There is something to be said for simplicity as well. The more gear steps you have, the more your effeciency goes down too.