Thanks for sharing this information and taking the trouble to post the photos.

I had to take apart my .500NE Merkel 140-2 to manually tension the safety spring. It came to the point where the safety would shift to the "SAFE" position with the first shot - very inconvenient. Now it works fine.

I also found this disassembly to be relatively straight-forward, if you have some experience in disassembling an A&D boxlock. Here you have a throughbolt, but that doesn't make it very much different.

Curl