Oh, and then I busted the other two trying to put them back in! They are 3+ years old, and seem to break quite easily. I looked from nylon fasters at the hardware store, but couldn't find small enough ones. I had some small stainless fasteners, and made sure they were only touching the grounded material. I don't know if I recommend it, but all is well for me. I kept the spring in, and just put a washer a nut to hold the spring down. Try to do the operation in a small room so when the posts and springs go flying, you don't have many square feet to cover to find them. I spent a good portion of the upgrade time crawling around on the floor looking for a lost spring...

I busted the little expansion fins on 2 of the four plastic connectors here. I was gentle, but they are brittle buggers. Heads up.