Ok, guys, had to replace a fuel pump on myb truck. Got the locking ring off, pulled the old pump and dropped in the new - no problem. But now I can't get the locking ring to go back on. Part of the problem is that the stock fuel pump had a thin steel rim, while the new one is plastic and thicker. Not sure how to get that ring back on, as I've pounded on it and am getting nothing but some fresh gouges in the metal. Any assistance is appreciated.