Hugh, As Dean said above, your gun is a .38 Double Action, not a Model 3 double action, which is .44 caliber. Quite often in guns as old as yours, the accumulation of dirt, crud, powder, grease, etc., in the action causes the gun to not cock correctly in single action mode. A good cleaning of the action will usually solve that problem. Carefully remove the side plate, with the correct screw driver, and flush out the interior with a good gun powder solvent, and reassemble. Ed.
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