Disassembling the NunchuckStep 1-Finding your Nunchuck:..It looks like this.
Step 2-Unscrewing the screws:There are two screws. So whip out your tri-wing screwdriver and get to twisting!
Step 3-Taking the top half off-Just like the wiimote, the nunchuck has 2 clips in the front. You may need to use a flathead to pry a bit, but I didn't have to. I just pulled until it came off. It'll look like this with the top half off-

Step 4-Taking the PCB out of the bottom half:The nunchuck internals/PCB come/s right out. Just pull up on the PCB. The wire can be a little tricky to get out. But just keep pulling upwards and wiggling. It'll come out. The analog stick also pops right off. Just pull up on that as well.
Step 5-Unnecessary disassembling:In this step, you're basically messing with the c/z buttons. I'm talking about this- (It comes off the PCB with ease... just 2 clips you'll need to unclip)

The gray pad thing slides/pulls right out. It'll look like this-

The little PCB also slides/pulls right out. It'll look like this-

And that's it! Completely disassembled!
Extra Information-If you wish to remove the actual analog stick, desolder the points that are identified by the blue arrows.. and unscrew the 2 screws that are identified by the yellow arrow.

For powering LEDs (Analog Stick LED Mod, C/Z Button LED Mod, Etc) use the following picture-

Have fun!
This tutorial can also be found at these links-
www.Ub3rsForums.co.nrwww.Nintendo-Scene.com