I went to fire up my Ofna Force 21 engine over the weekend and the pull start would not engage properly. I took the pull start off and turned the spindle by hand. There is some small movement in this spindle, pushing it does seem to engage the crank and pulling it out disengages it. I removed the end cover and removed the rest of the assembly, however, I am now unsure as to how this assembly actually works. I can see how the slotted drive plate engages with the crank pin for starting, but how does this engage and disengage? Any help would be welcome.