I've had my Vectrex for about 5 years now. Just last night, I turned it on and noticed the joystick was a bit loose. Not only that, but when I played Berzerk, I could only move diagonally down-left, and down-right. Does anyone know if this is a common problem and could direct me to a good repair guide?

I tried a google search and saw some controller repair guide, but I'm not so sure if it's for the same issue I'm having or not.