The 104 from Skymaster had a design change that came out after this air frame was manufactured. There was some concern that if the linkage or servo were to fail on the leading edge flap it would cause a situation that would be unflyable and I have heard of one incidence of this occurring. So Skymaster sent out the engineering fix to all those air frames that were already sold. You can see in the picture to the right that the leading edge flap drops down and is held there by the linkage to the servo. What Skymaster came out with was a phenolic plate with the opening in it for a steel pin that was mounted in the fuse. You can see the picture of the pin that needs to be installed inside the fuse and a picture of it installed and sticking out of the fuse where the wing attaches.

This needs to be done now before the fuse gets more complicated and access becomes severely restricted.