W107 380 SL US
Yes you are right! I was advised to check it and I checked it. I hope that this picture will help next owner to keep his mind clear. I'm thinking about 560, but I like my 380 so much. Will see. Some day...Yes, you said earlier that yours was a '85 US. By then (84 and 85) MB was back to putting double row chains in the US cars as well as ROTW.
It is a simple boroscope.can you post some details of what that contraption is?