Thanks guys for all the input, I agree with the just snug idea (probably a good technique here is the old saying "less is more" rather than over tightening). Was able to get at one plug last night as shown, although it took some good force to unscrew it. Doesn't look too bad to me compared to other plugs I have seen images of, but hey I'm no plug expert. Only other thing I noticed was a small amount of oil coating the threads as shown. Cleaned everything with brake cleaner, wire brush and 220 sand paper & put back in snug with a bit of anti seize. Hopefully at 64 years old I still have enough contortionist left in me to get at the plugs further in.
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