On our 1965 Caravel
, the Hehr window cranks are fastened to the window frame with clutch head screws. These screws have Zolatone overspray on them, so there is no reason that they were not OEM parts. (see URL for a picture)
I believe the original screw is a zinc 8x1/2" sheet metal screw.
Has anyone found a source for a replacement screw? (Suprisingly, many people suggest a philips or slot head screw, not realizing the importance of originality and the enjoyment of owing a vintage Airstream.)