Hey David, I would be very interested in some pictures of the correct mortar sights used for the 4.2. It seems that my mount was equiped with a cradle of the socket type. Unfoutunatly the socket have been broken off since warend. While cleaning I noticed on the cradle two bolts near the outher edge of the cradle, not far from the socket. They also are present on the wartime picture placed on my forum. Do you know of what use they were? I've posted also new pictures of the cradle (with visible bolts).
http://brechtsoorlogsmuseum.freeforu...-inch-t12.html