1987-1993 Mercury Mariner Outboards 70/75/80/90/100/115HP 3 and 4-cylinder Factory Service Manual, Page 386Get this manual
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17 Attach sta-strap to end of harness sleeve Tiller HandleShaft Bracket Installation
51603 RidgesGrooves (under handle)Tab WasherNutSteering Arm
2 Install retained spring and detent