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 sticksAdvanced modders- electronics/casework:
basically 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.shtml
buy kylejw's pre set up chip and follow his guide for building the translator and installing a psx/gc analoghttp://forums.benheck.com/viewtopic.php?f=5&t=36609http://forums.benheck.com/viewtopic.php?t=11318
buy 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.jpg
buy 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 ****