Sorry Mike, didn't work! Good idea that I've seen done with thin leather strips glued in there too.

Let me approach this a different way. The source of the problem is the barrel stop. I'm confident if it was tight in the knuckle the side to side play would be repaired.

The gun is a Miroku Mdl F SL. A close copy of H&H and a close cousin to Browning's BSS sidelock. Anyone know how to remove the barrel stop? It appears that it is retained by the hinge pin.

Thanks again!