So, I bought a 25N from a guy and it was filthy, so I took it apart and cleaned everything. I laid out all the pieces in the order I removed them and then... the dog tugged on the towel I had it all laid out on and everything ended up on the floor, so... I have no idea how to get the bolt/trigger assembly back together. I searched youtube but there are no complete take-downs / reassembly videos. HELP!