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take out that rubber piece, no oil will come out. there should be a threaded hole there. and the outside screw should have 2 flats for a knob.
heres some pictures of the adjustment knobs on the 500. last pic is the 2 parts new from suzuki, knob and screw, and the part numbers.
87 shock has 2 knobs, one on the rezzie and one on the shock. 88-90 shocks have a slot for the adjuster on the shock, and a knob on the rezzie.
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