Hello, i am looking for information regarding German tail fins, i have got a 500 kg German Bomb, normally there are screw holes to screw the Finn unit to the bomb, i have got a bomb that has no screw holes but 4 welding spots, is there any info about that the Germans were welding the tails to the body? is there a picture available? when they were welding has the tail Finn unit holes for the srews or did they used a special Finn unit