Originally Posted by
miamijim
Thats because your missing washer #5 and nut #14. You can work around nut #14 but grinding/filing to fit a nut with the appropriate threads. Finding a suitable washer may be difficult, I'd take the one from the other side and hit up HD, Lowes and Ace hardware. As long as the thickness and inner hole diamter are close your good to go. If the OD is too big just grind it down.
^+1^, and be sure to look in the PLUMBING section, maybe not the big boxers but a real plumbing shop: I have often found thin brass washers sold as stem shims or "friction rings" to be very useful in repairing shifters and RDs. These are washers but not called washers in the plumbing jargon.
And I've never had a SunTour barcon break on me (yet), they are very robust...but the #13 bolt and #14 nut are critical to how the ratchet performs, once you get it set right the #15 locknut should hold the setting, but a little blue Loctite on #15 is a great help, and helps prevent loss, too.