If it is a cheap freewheel you probably wouldn't be able to get replacement part for it, so i would recommended buying a new one. Also get an expensive one (eno, tensile, try-all) not an acs claw because believe me in the long run it WILL work out cheaper! One more thing make sure you have a bl*ody long poll pole handy when you try to get it off because they are a pain to get off, i used my old frame to get mine off