Mercury Mariner 8/9.9HP 4-Stroke Factory Service Manual, Page 227Get this manual
4Rotate plate clockwise onto shift arm extension and tighten bolt completely 3Secure throttle slide with retaining ring
aThrottle SlideRetaining Ring
aPlateBoltThrottle Arm Extension
4Insert shift arm into platform holeSlide throttle arm over shift arm cylinderb c
MODELS WITH THROTTLE ARM RETAINING RING 1Assemble remote cable retainer and push nut onto throttle lever stemc