2nd this. What surprises me in this is how the part failed. My understanding of over-torquing bolts when it's aluminum on aluminum is that the first point of failure would be the bolts and threads. This particular mode of failure is surprising.

I assume the most likely maintenance failure is over-torque, would be interested in understanding what other possibilities Felt has in mind. I don't think sweat can cause this. Or is installation of the spacer that important?