I just noticed: I think what caused the door warping was the addition of neumatic actuators, installed in 2008. Too much force continually being applied outward on the flexible material without a latch at that point. Not a good thing unless the entire bottom of the door would have been reinforced with rigid material. Whoever came up with that STC should have known better. I've got another question for those in the know. Is there a throttle friction knob on the 1977 280C? The knurled knob below the throttle doesn't budge.