Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-42794--1, Page 332Get this manual
INSTALLING NEW REWIND SPRING
ROPE INSTALLATION
1Remove retainers (used to keep spring from accidentally coming out of shipping container) 2Place hook (on end of spring) into sheave anchor and place support tabs (a) on container above spring recess, as shown3Insert large bit screwdrivers thru openings (b) and push spring out of shipping container and into spring recess in sheave