The Nose Gear brackets need to be riveted to the firewall angles and the tunnel sides. Some of the 470AD4-6 can be set with the squeezer and longeron yoke but the remainder are unreachable. I used the c-frame and back rivet set but I needed to turn the pressure right up the get the rivets to set. I think the steel nose gear brackets absorb a lot of energy from the gun. I had to drill a couple out as the shop head had bent over.