I have recently repaired a Rossi M68 3" revolver. It was missing the ejector rod and center pin. I have installed both and the gun is functioning. The back and forth lock up on the cylinder is impressive for the age of the gun, however the left right is concerning. Toward the rear of the cylinder, there is an insignificant amount of play, but toward the front near the arm, there seems about 1/32 of left/right. How do I tighten up the front of the cylinder? The hand is not worn and otherwise all function is good. Thanks!