Revymaxx,
Just giong to let you know. A cheap and easy way to add weight to the front is with BBs. I mix them with epoxy to hold them in place. You could probably build a little box on you motor box to keep them together while the epoxy dries. And all that is if you need the hockey puck back for the next hockey game. I have tied a bunch of different types of nose weight on, but never a puck.
Good luck
Alan