The chuck head base can be overtightened against the Retaining Cam Set and Check Head Cap by applying too much pressure to the Chuck Head Knob when securing a case in the Retaining Cam.
The good news is that there are three screws securing the Chuck Head Cap (pan head screw #6-32), but it is difficult to get a driver on the screw heads. I will try to remove the Hex Nut on the outside of the Head Shaft Assembly.
I was really disappointed with Lyman's customer service because I had called RCBS immediately before contacting Lyman. RCBS was extremely helpful and the customer service representative immediately offered to send me a replacement part.
