It's on a small Johnson o/b I believe. 8 HP if I recall correctly. Plainly enough there is no tension being created, in order to cause it to recoil when pulled. As you can see there is a spring inside of another spring that are used to provide that tension. At the base of the springs in the center of them there is a small hook. When the spool is inserted into and around the springs it grabs this hook at the base. The problem, I am thinking, is that it doesn't seem to connect anywhere at the top of the springs. Yes, no, maybe ??? <br /><br />
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<br />Picture above is view into bottom of spool <br />
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<br /><br />These last pictures are the view inside the springs as they are mounted on the engine/pull start assembly. The spool however is removable, just to clarify.






