(1) Purchased a Marsen Pneumatic Riveter. I am having some difficulty in determining the proper head size for the rivet being used. The heads are not marked, but I was able to use my calipers to determine which head was the proper one. The Pneumatic Riveter makes it happen a lot quicker, and the rivets have a good consistency.I am happy with the Marsen Product. (2) I riveted the torque tube to the frame along with the ribs as recommended by Rans. Prior to riveting, I had marked the center lines on all of the ribs.