Smoothed edges of all parts and realized I was missing the 833-F seatback top web. After going over my inventory CHECKLIST, I found numerous 833 pieces with a red chech mark next to the -F A call to Vans Aircraft monday should fix that. Constructed the hinge and two pin set up. Drilled the 1/8 and 3/32" locating holes then assembled everything together, except for the missing top we. I wonder if Vans will charge me?