After all this palaver, I dug out one of my emulators, it's been a while since they were installed.
Allen key 9/64", nut 5/16", not the most convenient sizes in the metric world
Valve plate 16mm, 1 hole ~3/32 / <3mm
Spring
free length 1 1/16" 28.5mm
OD 3/8" 9.5mm
ID 1/4" 6mm therefore wire dia. = ~1/16"
# active coils 9
No paint on the springs.
Based on these imprecise measurements, it calculates out to 69 lb/in, approx. a yellow 64 lb/in
http://www.racingsuspensionproducts.com/spring%20rate.htmI've been using 15W oil, 1.0 Kg/mm springs, 2 turns preload. Sounds like I should try blue springs and a few more holes in the valves?