Hey guys. I need to find out where I can get one of these old cheapy sis shimano derailleurs for cheap. The one on my dads bike has a toasted bottom "sprocket" (top one in the pic). It has alot of play along with getting hung up and being out of round, (i guess there is a bearing in the center) This is causing the chain to get slightly bound up right there. I looked on ebay, but didnt see this style. Also didnt find much on google. Any help would be appreciated. Thanks!