1991 bike. has 3x7 shimano sti/slr thumb shifters and brake levers. i recabled 2 yrs ago and of course i messed up the FD shifter installing new cable. i found a link online that shows the shimano M091 shifter and a warning to NOT remove lever cover. i did and now it will not shift. i found 2 online auctions for a complete set of shifters. 1 is at $20 now. there is one in the UK for $33. the cheaper seller says he is no EXPERT and cannot verify they work ok. they look ok. but they do have cables attached with the housings removed. so it looks like they were removed with a little care. haha. auction ends at 2pm today. maybe bid and see if they work? or can the M091 shifters be repaired? hard to track down a tech who knows what they are and can attempt a repair.