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If you can get the leaker out from the rear, you may not need to remove the valve cover (and rear bearing cap).
I replaced a popped-out plug (without touching the valve cover) by pushing the new one in from the rear. I pressed it in with a flat bar, using a wood block against the firewall as a levering fulcrum.
Then I secured it (just in case) with a DIY retainer strap as in the picture. The tapped holes are already in the head.
It's still OK after 30-40K miles or more.
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Bruce Young '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
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