1986+ Mercury 6/8/9.9/10/15HP 2-stroke Factory Service Manual, Page 289Get this manual

TILLER HANDLE
5Position tab washers to lock control cables to holes of cable anchor bracket
aTab washersHole 6Rotate tiller handle twist grip to NEUTRAL7Adjust jam nuts to remove slack from control cables while allowing full travel of throttle shift linkage

aJam nutsCables

• ATV
• Jet Ski
• Outboard Motors
• Personal Watercraft
• Snowmobiles
• Stern Drives