So... I've got my snap caps in and I am doing some dry firing trying to smooth out the trigger a bit. All is well and then I randomly try to pull the hammer back and it wont pull back. Strange. I then try to pull the trigger and the trigger is bound. Also, the the cylinder isn't locking up. I can just spin it. I find a you tube video that shows how to detail strip it and figure I'll take it apart and see if I can see anything. During the course of the detail strip I end up with a loose part that doesn't seemed to be talked about in either of the detail strip vids I watched. A picture is attached. What is this thing? And how screwed am I?