Look at the back of the throttle plate (if you can) and you will see that the exposed end of the screw appear to have been spread by some sort of tool and will look like a chisel mark smack dab on the end of the screw.
Probably a special compression tool of some sort used during assembly.
That's why one needs to file off the exposed threads before attempting to extract the screw in a normal manner when removing the throttle shaft for bushing installation to repair a worn carb body.
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