button question on classic controller

[Dkw0101]

ok,, on the classic controller theres a button between the 2 z buttons and I have no Idea what it doesn, what does it do exactly?

 

[Zeros]

It moves a spring-loaded clip thingy in the back of the controller...what that thingy is for, though, I have no idea.

 

[Dkw0101]

It moves a spring-loaded clip thingy in the back of the controller...what that thingy is for, though, I have no idea.

lol thanks for the help

 

[Steve B]

looks like it will allow the controller to clip to something, i.e. a piece of plastic that attaches it to the wii mote (think i saw a pic of this somewhere)