I need your help guys, I pump the rifle without cooking it, and of course did not fire, I did not hear the hissing sound because of the loud music , then, I cooked it and again pump 12 times and now the rifle won't shoot, it makes the triggering sound and you notice that the trigger mechanism is working but no release of pressure, I would like to dismount and fix it, but i need to bleed the pressure out and do not know how to do it, could anyone help me with instructions or any YouTube video or something like that, I am an old guy that need help.. Thanks in advance...