Gave up fooling with it and drilled it out this morning. Easy and took just a few minutes. Went in above the keyhole to get the tumblers, but no luck. Then just went through the keyhole with a 1/4 inch and that did it. Picked up a Bauer 013-535 Trailer lock at Camping World and it was a perfect fit. $41.79 plus at CW. Cheaper online but needed it now. In hind sight, the original metal back plate was sturdy metal vs the composite of the new one. I kept the old one and will probably replace it some day when we are not triple digits heat. The drama is ended. Bill