My brother gave me a RCBS Pro-melt. He said it was leaking and that he might have broken the tip of the nozzle shot off rod. I looked at the Pro-melt instruction manual and it looks like the tip is square. Is this correct? I can order another rod, but if I don't need it, it would be a waste of money. Any one have any ideas how to stop the leak. I thought I would ask before I screwed anything up.