Mercury Optimax Models 135, 150, Direct Fuel Injection., Page 471Get this manual
ATTACHMENTSCONTROL LINKAGE
STEERING LINK ROD INSTALLATION
WARNING
Steering link rods MUST BE secured between outboard steering arm and steering cable end, using special washer head bolt (10-14000) and two nylon insert locknuts (11-34863), as shownBoth special washer head bolt and nylon insert locknuts MUST BE tightened as specified