Fitted the 650 latches under the longerons and with a bit of careful measuring and filing, they turned out perfect. The bearings I placed 5mm further foward than specified in the plans so that I could pick the existing rivet holes without interfering with the edge of the pivot hole in the plastic block. I cut the seat back supports down in length but not width as I saw no need to trim them down. I will rivet a support back underneath the parcel shelf to add a little stiffness.
positive locking at 95 deg measured on the back side not the pivot point
