I had some Coleco Gemini Controllers included when I bought some games off a kijiji ad and when I bought a system.
I opened them and cleaned them and there was black gunk all over the connectors. I first ran it through stella with the 2600 daptor 2 and it was funny. The dial moved the ship in defender and the stick when I pushed up would shoot but when I had the case off it would work no problem. I tried ms pac man on a 2600 and it worked the button worked and the joystick worked (with the case on). When I tried it on breakout the dial worked but I had to press up on the joystick to shoot the ball (This was also on a 2600).
Now what I think it is I used too much rubbing alcohol and took something out of the board but I just want to fix and remedy it. There was possibly some black gunk that was supposed to be there possibly?