I tried to ride it for the first time in a couple of years (knee surgeries). Looks like it took a blow from something in storage. It may be adjusted out, but as old as it is, I thought just better to replace it. I think it is an LX Deore of the downpull type. 3 rings. Not sure if there is NOS parts to still find out there, or what's the next best replacement. I don't need XT, XTR (if they even make it anymore), but whatever will work. Part advise pleaseeee?? Thanks!