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I've only had to replace one, but didn't remove anything.
I cleaned out the recessed bore by feel with a rag, then started the new plug in by hand and pried it "home" with a flat bar — using a small wood block in the plug to pry against, and a larger one on the firewall as a fulcrum.
I don't remember if I put any oil or grease on the seal first, but a little shouldn't hurt, and is generally recommended when replacing other seals.
I also secured the new seal with a home-made retainer plate, using Don Foster's suggestion below. The tapped holes (for the usual 10mm hex bolts) are already there.
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Bruce Young, '93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.
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