I don't know if I mentioned it here but I'm a fellow Shizuoka owner. Mine's an AN-SB which is almost identical to the more common AN-S. Mine came from the factory with a fixed belt ratio and VFD although I had to replace the original VFD.

I've got the manual / parts list with section drawings if that would be useful. I've also stripped down and rebuilt most of the machine apart from removing the actual saddle and table for understandable reasons. I took lots of pictures if you want to know what I encountered.

The machine's where I live near Blackpool although I work in Leamington.