Neil and listee's,
That's one I had not heard. Since I actually have some DA10, that would have been good knowledge, however, I have contacted a wide variety of chain makers, industrial and otherwise and no one had that "magical" 10 x 3.5mm pitch. There are a few that might be close, but you would be wearing out your cogs and rings from it not being "exact".
DW
Didn't I hear correctly a while back that the chain for Shimano 10mm pitch was available (through Sears??), and is the chain used to raise/lower garage doors. Or is this a popular myth? If correct, maybe they have some sprockets that could be modified to screw on the rear hub also!
Neill Currie
Hillsborough, Nh, USA.