I noticed the outer gear door was very loose around the hinge on one side. CARF used 4mm brass tubing for the hinge pins on the inner and otter gear doors. On one wing, the pin had slid almost completely out. The total hinge length is ~45mm but the pin was less then 38mm so it only had about 1-2mm holding it on one side of the hinge. So I had to cut a new pin to 45mm and the door is much firmer. Same for the inner gear door, except this door just came off only slightly shaking it. So going to cut a longer pin for the inner door and glue a stop so the pin can't slide out. Strange that this problem was only on one wing. the other wing was fine