Yep, you can see from the attached pix with the original note, that bolt's snapped off in there. I'll bet the original owner over-tightened it, piled it into something, and it broke. And it musta struck dead head-on to the prop shaft, 'cause, otherwise, the motor looks brand new. Not a scratch.

And I do like your tip, about opening that throttle arm and then bending it over. Got it wired open now, but I surely hate to have bits of wire strung up on an engine, no matter how tight they look.

Thanx, Clean, for the hit,
M