Assembling back a Hori Hayabusa stick. Assistance needed.

Hello, I'm an owner of a Hori REAL ARCADE PRO.V HAYABUSA for Playstation 4 & Playstation 3, and for the longest time I wanted to the replace the standard spring that comes with the REAL ARCADE PRO.V HAYABUSA for a 2lb spring. Well, I did that but I happen to run into a major issue that I can't figure what went wrong or what I did wrong. As you can see in the picture, the arcade shaft is much lower that what it actually should be (as if there isn't anything to keep on place) and sinks down. I can't even hold the stick properly at all. Now, I had tried numerous times taking the stick apart and reassembling it together to no avail. Can anyone offer some advice? Thanks.

http://imgur.com/cVSHn2U

http://imgur.com/ZfTOojf