Ooops... almost forgot. Don't reuse that bolt and washer if you can help it firerigger. Get a new bolt, which comes with a new cup washer.
The new bolt will have dry Loctite on it, so between that, a new washer and the correct torque value (and a little dab of paint) you shouldn't ever loose another one.
Very good to hear that you didn't go down and didn't crack the cases.