Thank you, Joel for helping me see my error!! I re-attached it tonight paying careful attention that I really had those nubs firmly placed against the back of the foot and so far the plate is not working it's way loose like it was! I had it close before apparently not as snug against it as it needs to be.

Thanks again, Joel! Gosh, that is why I have always loved this place ...always so helpful even down to the littlest things!