I have a TC pro hunter and trying to figure out the proper way to clean the breech. As you can tell by my questions I am new at this. Can I clean this or do I need a new breech. I checked and they are $50 so I rather clean it. I heard of the 1/8" drill bit but how far are you suppose to go in with it? As you can tell on this picture is this the way they are supposed to look like?