If you guys want to repair your broken N64 control sticks, feel free to have a look at this thread:
N64 Stick Converter kit (PCB + Potentiometer)This is essentially a kit that enhances the
GameCube-style N64 replacement control sticks found on Ebay.
1. You need one of these from the bay. Seperate the housing, take the plastic stick and cut off the wires. Throw the crappy PCB and potentiometer in the bin.
2. These are the electronics from the kit (PCB with improved chip and improved potentiometer). Combine these parts with the housing, wires and plastic stick.
3. Profit!
I tried this by myself and can happily confirm the stick feels great and plays superior in GoldenEye, Super Mario 64 and many more N64 games. From there you'll never ever want to go back to the original control stick or even the Hori Mini Pad 64.