I have a 12 tooth front sprocket but how do i put it on , is there any guides to putting it on or anything ( ya im newbie )

 

its just held on by 1 bolt and a lock washer pry the lockwasher down with a screw driver or hammer enough to get a socket on it then take it off, then put the new one in the chain then bolt it back up and bend lockwasher tabs back in.

 

thanks