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There is no way to get to the left screw. Door panel is on the bottom of door. Its a 64.
1961/66 F100/1100 is the same, as is 1963/69 N/NT500/1100 and 1967/69 F800/1000. Remove the access panel (21122 in pic) and you can get to anything inside the door.
On all the ones I removed the screw on the button end was a Philips head and the one on the other end was a bolt and needed a 5/16 socket to remove it. A 1/4 inch drive ratchet works great up in that tight space.
There is no way to get to the left screw. Door panel is on the bottom of door. Its a 64.
Take the bottom panel off your door. Roll the window all the way up. Look up inside the door and you will see the bolt use a 1/4 inch ratchet and a 5/16 or 3/8 socket to remove the bolt. Then remove the phillips head screw on the outside of the door that holds the other side of the handle.