I just picked up an older Taurus model 85. The problem it has is that it misfires when shot as a double action. If I manually cock the hammer before each shot it fires everytime. But if I just squeeze the trigger without cocking the hammer first (double action) It fires about one out of five times. I should also mention that the timing/cylinder alignment is fine, and the firing pin is hitting the primer everytime. I believe I have ruled out the ammo, as I shot 20 rounds single action, and 20 double action. All the single action rounds fired, and only 5 of the double action rounds fired. And it is not specific to any cylinder hole. Anyone ever have this problem? Or have any idea what the problem might be? I would like to fix it myself if I can rather than send it off and be without for who knows how long. Thanks in advance.