I have the two different heating elements, one 5500LWD from Home Depot, and the Camco 5500. I used a Greenlee 1 1/4" radio punch to punch my hole in the kettle. Now after doing this neither element fit in the kettle. I used an 1 3/8" step bit to make the hole a little bigger and the element fits but only by threading into the hole. Is this normal or should I make the hole bigger so the element fits easily in and out?