1986+ Mercury 6/8/9.9/10/15HP 2-stroke Factory Service Manual, Page 296Get this manual
MANUAL STARTER
Starter Rope Replacement
1Remove rewind starter from engine, as outlined previously
NOTE: If starter is broken, remove all remaining rope from sheave2Disengage starter interlock from starter sheave3Pull starter rope handle out from rewind starter about 30.5 cm (1 ft and tie knot at this point to prevent rope from being pulled back into rewind starter4Remove rope retainer from starter handle and rope
aInterlockStarter handleRetainer
5Install starter handle on new rope [cut to length of 157.5 cm (62 in]Tie knot into end of ropePlace knot into recess of rope retainerInstall rope retainer into starter handle