A few weeks ago, I pulled out my (day one) N64 controller and after many years of use as well as being stored poorly it was suffering the dreaded “saggy stick syndrome”.
After deciding to restore the controller, I looked into replacement sticks. After doing some research I found that these sticks fall into two main categories. Ones that replace the stick in its original form and others that use the GameCube design. In keeping with the original atheistic and feel, I choose one that was modeled after the classic design. The unit I picked was the Old Skool N64 Sharpshooter optical joystick.
Check out the full guide and my experience here: http://www.retrorgb.com/n64oldskoolstick.html