I was curious about the comment regarding Phillips head screws. According to what I could find the Phillips screw was invented in the early 1930s, and manufacturing started in 1935. Use of the screw quickly spread throughout the automotive manufacturers and by 1939 only 2 manufacturers were not using it. By 1940 all manufacturers were using them although one still used slotted heads on passenger cars. 85% of all the fastener manufacturers were making them and 10 foreign manufacturers had purchased licenses. ( I couldn't discover which ones though)
Evidently aircraft manufacturers in the USA also adopted the screw about the same time. I found two specific references to prove it.
The first is from the J3 Cub forum:
"The slotted head screw story is an example of repeating something often enough until it becomes the truth. Piper used Phillips head screws way back, pre-war. Interesting in the video at 3:01 they show the well known photo of the L-4A or B instrument panel that is loaded with phillips head screws."
The second is from the US Army Air Force:
PROOF DEPARTMENT
ARMY AIR FORCES PROVING GROUND COMMAND
EGLIN FIELD, FLORIDA
FINAL REPORT
ON
TACTICAL SUITABILITY OF THE P-38F TYPE AIRPLANE
6 March 1943
m. Maintenance.
(3) Considerable time is being lost due to difficulties in removing inspection panels throughout the airplane structure. It is believed that a great percentage of these panels could be installed with dzus fasteners which could then be removed in a matter of seconds and not hours. All panels now installed with Phillips head screws have a tendency to freeze making their removal impossible without the aid of an easy-out tool.
(8) Inspection plate be installed to allow inspection in rear of instrument panels. At present there are ninety-six (96) Phillips’ head screws that have to be removed to perform inspections or maintenance work on instruments.
I think the statement that slotted head screws were used is correct at least for German aircraft. I found a comment from the group rebuilding the Me-262 on the advice they were getting from the Messerschmitt Foundation:
"Overall, though, the team has stuck as closely as possible to the real thing. While aluminum would have been lighter, the skin was made of steel, like the skin on the originals—a concession to wartime aluminum shortages. The instrument panel was made from plywood, as were the landing gear doors. The use of Phillips-head screws seemed like a reasonable substitute, but guests from the Messerschmitt Foundation, who planned to make a flying copy of the Me 262 the centerpiece of their collection of Willi Messerschmitt-designed airplanes, insisted that slotted screws, identical to those in the original, be used.
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I couldn't find references for British, Russian, or Japanese aircraft. But at least the American WWII aircraft did use Phillips screws.