As I posted earlier, I found a set of NOS 10 pitch Dura Ace cranks. I was about to put them on e-bay for lack of chainrings but I found somewhat of a solution. Takagi made a 1/2 alloy conventional pitch sprocket in different sizes (usually black) called the "Takagi MX" The BCD is almost spot on. The chainwheel bolt holes are smaller than usual (it used a nut and bolt originally) but can be reamed or drilled out to accept a conventional chainwheel bolt. The chainrings are not too rare and can still be found.
It might be a cheesy way to get around, but it's better than them sitting in a parts box wasting away
Rick Gaytan
Pitching away in 10mm in
San diego, CA