Purchased the Avery RV kit to practice with while I await my RV10 kit purchase arrival. The gun comes with two coils which retain the rivet head. One is silver colored, has about five coils, and easily screws onto the rivet gun. The other is black, shaped like a bee hive, has about 13 coils, and does not easily screw onto the rivet gun. What do I use this latter bee hived shaped coil for and is there an easy way to attach it to the rivet gun