I got my Roller recently, and right off it worked fabulously, but lately I've run into a problem with the top pin, it seems to be just a little screw that you can adjust, but it does not stay put, and if I screw it all the way down it will not fire my Kraken, so I have to adjust it up, but it won't stay put because it just spins freely, so it moves and I can't keep it where I want it. Now when it fires the Kraken it fires weak, or not at all and that screw moves around. I think there has to be something I'm missing here. Anyone care to clue me in?