Sam,
If Bill isn't responsive I know a guy too.
I don't have any experience either. I understand the concept , just no real life field work on them ( only dealt with one system a few years back)
There is a guy on another forum that is from the south that 90% of what he deals with is indexing valves
His user name is Buck_Wheat on lawnsite.com, shoot him a message
http://www.lawnsite.com/member.php?u=109581 , there is a irrigation forum. Though it's mainly for irrigation pro/ companies and not for homeowners.