The reason the lock plug (barrel as you termed it) came out was that the
retaining screw was not treated with a thread lock compound (ie lok-tite)
upon re-assembly.  This is really necessary on most VW locks using retaining
screws.  It's use is standard procedure for any locks I service now.
Steve Sandlin
Steve's Lock Shoppe
'84 Wolfsburg Westy (starting head surgery tomorrow)
'79 Kombi
'00 New Beetle

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