Well my Linksys WRT300N Router was rattling. Had something broken loose? I needed to find out. So here are the steps to take the router thing apart. along with pretty pictures that you guys really like.
- Turn the router on its back and lift and rotate the four feet out of the way.
- Gently pry the blue bottom plate off. (Go in from the front and use very small flat blade screwdriver)
- Gently pry the translucent bezel off. There are 4 clips holding it in.
- Turn the router right side up and do the same thing for the top plate. Be careful not to lose the black button.
- Turn the router on its back again, and remove the 4 torx head screws (T05) but beware 2 of them are anti-tamper ( you can remove these with a small flat blade screwdriver)
- At this point, the router is well in the nude and you can have your way with it.
- Reassembly, do it in reverse. Steps 5 through 1 in order.
- (in step 3 be careful its easy to get the bezel on the wrong way.)
- Fins!
So what was making the rattling?
A small piece of gray plastic about 1mm x 1mm x 1cm.
I couldn't find out where it came from but who cares? The router works, it was just annoying. And best of all it doesn't rattle anymore. LOL 
