Alright guys, quick question before I make any mistakes I can't fix. I'm building Whiz's table and I'm trying to figure out the distance between the upper frame and the lower frame. He calls it dimension "X". Anyway, dimension X is supposed to be 15" for a Large Egg with a spring hinge or 17" for a Large with Autolock hinge. The problem is my egg isn't at my house so I don't know which one it has. I just bought it last week if that helps. What is the standard hinge?