Keith,
There is a bit of play in the top lever. If I lay my right thumb against the right side of the toplever and put a slight pressure left, the barrels tighten right up and the toplever is still just right of center.
Yeah Bill, that's what I meant. By holding the top lever to the left, you are assisting a probable weak top lever return spring. As I said earlier, this is a pretty common ailment in Lefevers. I don't know if Lefever Arms Co. made their own springs in-house, or sub-contracted them. But I've often wondered if they didn't buy or make a very large batch out of the incorrect spring steel or utilize improper hardening and drawing. I can only recall seeing one Lefever hammer spring that was an obvious replacement, but lots of weak or broken top lever springs. Good luck trying to find a good original, but fortunately, it is nothing complex or difficult to make.
I've bought several Lefevers that turned out to be a different gauge than I thought I was buying. Some shrunk on the way home and others got bigger. Strange how that happens.