I had my wife hold the rails while I screws in the bolts for the rails. I threaded them until they were flush with the inside hole and lined it up to the cage nuts and screwed it in the rest of the way.My rails are the same. What's the trick to securing them to square hole racks? 10-32 cage nuts don't work well since the bolts bottom out on the rails before the bus are pulled in tight.
I have to fix one but it is much easier now that it is in. I'm hoping I put it in the right location in the rack so I don't have to do it again.