Have XT Unsingle, seeking the two small rib clamp screws (not adjusting ones on top, but two small ones opposite each other.
Is Browning the best source for such a small item (but necessary)?
I believe they are called rib pivot screws. If they are working loose, try this. There should be one washer on each side. Add another washer to one side or the other. What happened to my Cynergy is that the screws are long enough that they are touching in the center with just the diameter of the screw. This is not enough contact to hold. By adding an additional washer to one side, this allows the screws to seat against the washer. Never worked loose again. I got mine from Brownell's. Good price and quick shipping.