Spyder's Pop-Up

I was hoping we'd do some pneumatics at this last Florida Haunter's make and take, but alas it didn't happen this time. However our friend "Spyder" (John Nilsen) had his pop-up on display and was kind enough to show us how it's put together. I was expecting a little "psst' and it would pop-up 10-12 inches like most do.
...Wrong!
This thing popped up about 48 inches and the arms came out from it's sides! It's a guaranteed "loss of bladder control" for at least some of our Halloween guests!

Note to self :  "Must find cheap 36" plus air cylinder.... Forget anymore store bought pop-ups this year!"