The wedge is probably the most over looked for accuracy of the weapon. It should not be pounded in or out . Should be able to remove with a finger push as well as install. Not as prevalent today as in the past, but no two wedges were the same. I always kept extra wedges in the bin and most were hand made in the shop. The wedge can be fitted with machine black or lamp soot and a feeler gauge, and yes an ample amount of time, .002-.003 cylinder gap should present good results, but the barrel has to be square with the cylinder to prevent gasses from escaping faster on one side. Mentioning gasses escaping, make sure the barrel is square cut at the muzzle.
i am going to try sourdough's shim washers in the arbor recess if the need arises, sounds easier and quicker.