adjusting shimano sis derailleur
I have an 18 speed bike. with shimano derailleur and grip shift. I know the back derailure is out of whack.. Meaning the cable is out of adjustment, and it is bent.. It will somtimes jump a gear, and it will not adjust to where it will shift right. I can hear chain noise as it goes through the derailleur. Should I try to un bend and adjust? Or just buy a new one?? And could some one explain the proper way to adjust gears?? I can't afford to pay some one to put on a new one, so if I get a new one I need to know how to adjust it.. I have never been taught the proper way to do it. Thanks again..