Hori VX not properly registering down input

I've had my Hori VX for about a year now and, despite not being the best stick, its served me well in learning. I ordered a new madcatz stick during evo, but just recently my Hori stopped properly registering the down input.

I took it apart and attempted to clean it, but it hasn't fixed the issue.

Holding down works sometimes, but it usually enters as a double input, causing it to be impossible to crouch properly and do certain motions. Any advice on how to fix this? I also own a Hori fight stick for Wii. Is it possible to swap the sticks between the two?

Apologies is this is the wrong section if the forum for this question.