Mercury Mariner 30/40 4-Stroke Outboard Service Manual 1998, Page 504Get this manual
TILLER HANDLE
12Secure tiller tube with retainer13Snap the engine start switch on the tiller tube
aPulley AssemblyThroille Lock Knob
cRetainer
dScrew-M5x16
Tiller Tube Retainer Screw Torque