Rocket man, A check of the 1948-51 Shop Manual instructions for your door question doesn't give any other info except bending those tabs for removal and installation. Perhaps there is a trick other Bolters have used, but I'm not aware of one myself.
~ Dan 1951 Chevy 3 window 3100 Follow this story in the DITY Gallery "My Grandpa Carl's Truck and How it Became Mine" 1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)