Start with good six sided socket
As you have noted these are a pot metal which are easily deformed. On my trucks I freed them up even slightly bent ones using two good snug fitting 6 sided sockets. With a deep socket fitted over the barrel end I vibrated the outside of the socket with an air chisel with a flat ended tool bit. The trick seems to be to pull the trigger just hard enough to get that fast light tapping not the hard punch. The vibration seems to break the corrosion which will allow you to unscrew the barrel. Next is getting the brass bulb base out of the socket.
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