Shahinian Obelisk vs VandersteenTreo

I looked those SPL meters up, and  I can get a cheapo version here.

Great, now we're getting somewhere. You can even substitute some bolts for the cones, until they arrive. Just get the proper thread( I think it is 3/8-16).  Put the bolt head downward and add a lock nut. The spikes are about an inch to 1.25 inches tall (at least on my Treo's), so you would probably want a 1.75 inch bolt(depending on how level your floors are). Follow the manual's set up directions for angling and you're good to go. Then on to equalizing them.
B

5a cones are 1/4 x 20 i believe.....probably rare as hens teeth in Russia....

They are. We are all metric and centigrade, you know...

As for the size: "The two fronts are cones ¼ X 20 threads and a special spike in the rear with spacers for tilt 3/8 X 16 thread."

So, total we are 4 front cones and 2 back spikes, right?

(()(So, the total we are 4 front cones and 2 back spikes, right? )))))
  Yes correct

Having them manufactured locally. Will show you pics once they are ready.