So I brewed this and have now had it kegged and serving on nitro for 2 weeks - I don't have a side by side to compare it Boulder Shake but it is very close to what I remembered it - and after to serving it to a few friends, people are digging it! I only had a couple pints of the original...
I also found this which may work for most ball valves....
http://shop.greatfermentations.com/product/blichmann-ball-valve-seal-kit-1-2-in/blichmann-replacement-parts
I called homebrewstuff.com, whom I had purchased my mash tun from, and they are sending me 2 new washers at no charge for that valve. I'm surprised its so difficult to find the washers for these valves