This Guide is a WIP, i originally posted this on smashboards and will improve it/add more details in the future, please reply if you think i've missed something
Replacing Official N64 analog stick, using gamecube/psx analog sticks
Advanced modders- electronics/casework:Read This
http://kylejw.heliohost.org/index.shtmlhttp://nfggames.com/forum2/index.php?topic=3574.0basically the two links are for deciding whether your more comfortable with AVR or PIC's.
Memium level modders- casework/low level electronicshttp://kylejw.heliohost.org/index.shtmlbuy kylejw's pre set up chip and follow his guide for building the translator and installing a psx/gc analog
http://forums.benheck.com/viewtopic.php?f=5&t=36609http://forums.benheck.com/viewtopic.php?t=11318buy a superpad64 and just swap it with a psone/gamecube analog. (it uses potentiometers unlike official n64 controller)
i can use a screwdriver modders- can use a screwdriverhttp://www.nintendorepairshop.com/products/71-N64-Controllers/1821-New-N64-Controller-Thumbstick-Repair-Part/http://i102.photobucket.com/albums/m98/TrekkiesUnite118/Analog3.jpgbuy that, havent tested it personally but pic should explain.
everything that isnt in noob level requires case work with dremel, abs cement, epoxy putty/bondo, and paint for a pro looking product. it can be done with just hotglue but it'll look and probably function ****