My old Nintendo is giving me some trouble. Some games it plays just fine (Super Mario Bros / Duck Hunt), some games it will play only if I get the cartridge wriggled in just right (Crystalis, Double Dragon), and some games it just won't play period (Legend of Zelda, Tetris).

I apologize for asking a question that's already been asked about a million times, but I've already tried all the methods to fix it that I could find with no success. I've already tried (In this order) cleaning the 72-pin connector, bending the pins of it slightly, disabling the 10NES lockout chip, replacing the 72-pin connector with a new one, and no luck. Absolutely no luck, it just keeps doing the same thing over and over. And yes, I've cleaned the games thoroughly as well using 99% alcohol.

Anyone have any additional ideas? I'd be willing to put on a grass skirt and do a rain dance if there was any hope of it making my NES work again.