This is the clean bearing block and the base of the shifter housing. A thin brass washer goes first (not shown), then the shifter housing base goes on top of that. It is easier if you disengage the little downshift pawl spring so that the pawl doesn't get in the way, you can put that back on last before the brake lever goes on. Same goes with the downshift (release lever) return spring. Next goes the thin washer with the tab. The tab points up, and in this left shifter, it goes toward the center of the bike. It can only go two ways. The center piece with the hook goes on next, then the spring, which fits very lose. (no lube shown for clarity, you should use the recommended lube on these pieces.

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