When properly fitted there should be a few thousands between the barrel flats and the bar in the area about midway along the bar. Less so as it gets towards the hinge pin/knuckle and just about none right at the corner where the bar meets the standing breech. There should be none, zero, nada between the breech face and the barrels. The afore mentioned gap allows the bar to flex on firing. Think spring. Super important. Reduces shock to the whole locking mechanism. If some fool has removed this gap then put it back by removing metal from the barrel flats, not the bar. Remember, just a few thousands. If the tool you intend using is anything other than some emory cloth and a piece of wood then you are doing it wrong.
nial
