B-52. Here's a pic of the back of the head:
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What kind of tool should I use to unscrew it without gouging the metal up? Maybe if I soak it in some penetrating oil overnight it will help.
... If that isn't it, I wonder what purpose those three holes in the back of the head might serve. Might be worth investigating? I'm stumped.
Op's ratchet is the 1 st version from mid 50s to mid 60's.....
Find a 2$ spanner wrench at a hardware store I know the holes are small but file the spanner tips if you have to then it's always easy to take apart