I have 2 Avengers (refurb's) that I bought from Pyramyd about 1 year ago. Both have developed serious air leaks and need work, I have the o-rings, what I need is a video on how to take the gun apart. I can easily remove the gun from the stock but after that, I don't know where to start. I have no idea of where the leak is, and at 82 I've lost about 20% of my hearing.