For that sort of keg i made this tool
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Just 2 bits of rod welded to a flat bar. 1 goes in the hole. Other one rests up against the edge of the top. Put it on the other side to do up.
Can do and undo it.
Slightly undo to release pressure.
Tighten back up and put some vice grips on the center piece and pull up and twist then let it drop into the keg.
Undo the main part and take both bits out.
If you cut the tag off on the outer spear part(bit stopping you getting it out without dropping the center) you can just screw it back in as a lid. :handgestures-thumbupleft:
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