Old 03-16-14, 02:30 PM
  #7  
Jeff Wills
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If it's "missing" one of the intermediate gears, verify that the "friction/SIS" switch on the side of the shifter is all the way towards "SIS". If the center screw is loose, the switch can move out of position and create indexing issues. I've heard of many 9-speed bar-cons being ruined by loose center screws, too- get the biggest screwdriver that will fit and torque that puppy.

If that's not the case, take the shifter off the mount and verify that the indexing washer is correctly oriented. It will fit on the shifter body four ways, but only one it correct. The correct orientation is shown in this PDF:
http://techdocs.shimano.com/media/te...9830628723.pdf
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