I used a brass rivet set to get these NAS bolts in place and it worked perfectly. No marring of the bolt and with 40lbs of pressure you can adjust how far you want to push them in, Remember on a 7A the bottom bolts have to pushed in so only a few threads show and then you start the nuts and draw them into place with the wrench. There is just not enough room between gear weldment and the end of the bolt to do it any other way. The NAS bolts are all in and torque to the proper inch pounds which is no easy feat because of the limited room. Remember the bottom bolts have the washes on the bolt head side, since they must be torque form the head side.This is not an easy job and it did take about 5-6 hours, but if you take time and follow the instructions it it a job that can be done with only a few scraped knuckles.
