This of course means that the unstarts encountered early in the program were far more violent than most encountered later.
I worked in the sheet metal shop at Beale from April 1966 until February 1969 and unstarts were a way of life. They would crack and bend stiffeners and angles in the nacelles. We would have to drill out the damaged angles, fabricate new ones and reinstall them using bolts and nuts. That way the next time there was an unstart it was easier to change a damaged parts.
I even replaced a cockpit liner after an extremely violent un-start. The pilots helmet hit it so hard it cracked.