[Tom Line]

We're definitely not using a torque wrench, but we're also making those bolts pretty tight. (I generally have a good feeling for pretty tight - I work in an engine plant and deal with a lot of bolt torque testing). I'll check on the torque next we tighten them and compare it with the recommended torque for a grade 8 fastener of that size.

The more I think about it the more I think you're right about the fasteners taking all the shear rather than just acting in tensile. Thanks for the suggestion.