AlcohlicDonkey wrote i was recently modding my controller and i accidently pulled off the left thumbstick, i put it back on and tested and nothing happens
if needed ill post a couple pics of the controllers

You will probably need to buy a replacement one.
Link:http://www.niktronixonline.com/Talismoon_Controller_First_Aid_Kit_Xbox_360_p/x360contfirstaid.htm

just take the controller apart and pop it back on, simples ;)

R3MiiX_MoDzZ wrote just take the controller apart and pop it back on, simples ;)

i dont think thats what he ment but idk
i think he me the thumb stick motor and in this case i belive you should purchase a new motor i can sell you one cheap just let me know

R3MiiX_MoDzZ wrote just take the controller apart and pop it back on, simples ;)

i've done that twice and the thumbsticks are out of alingment i have a place that will fix it for me i have watched tutorials on how to take it apart and put a new one on looks a bit to hard for me even though i know how to use a solder knife