Bob,
I've never disassembled a Borchardt before and was surprised at how easy it was and at the simplicity of the action.
Here is a series of photos showing the metal work that Harry did on the action to accommodate a tang safety as well as attach a trigger bow for creating a more elegant lever.
This is the top view of the action rear showing the toggle that connects the trigger with the sear. This toggle rides in a slot. The safety has a pivoted lever that interrupts the forward progress of the toggle by blocking the trigger.
This is the bottom view of the action and the safety lever can be seen. Also the method of attaching the trigger bow. In the previous photo the purpose of the hole that passes through the toggle can be seen as it allows the screw that holds the trigger bow in place after it has been fully moved rearward and locked in the slot.
With the exception of the hole drilled through the toggle, this is an original and unaltered Borchardt part. This is an original trigger as can be seen by the part number and has had a piece welded on and shaped.
Harry stamped the lever and the "12 67" is the year that he marked it. I have no explanation for the fact that the barrel is marked 1980 and that Carl said the rifle was completed in 1983.
Very nice metal checkering that was most likely done by hand.
The striker pin was reduced in diameter and was disc bushed.
Hope this is what you were looking for.
Dennis