I had the same thing happen
I am bolt tapping impaired and couldn't get it to take a bite, so I was able to run a nut/bolt/washer/lock washer through. It was a tight fit, but I was able to get it done. I have checked it a number of times and all is secure and there is no rubbing against the shock or anything else.
I think hassman has the right approach, but I couldn't get it done, so I went with my low tech approach and it has worked just fine.