I think the check has two screws holding it to the inner door frame. You might be able to get a ratchet and socket in there to remove, but really, it isn't that much more trouble to take the door card off.

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1981 300TD 310k miles
1970 280sel 172k miles
1966 230 Fintail 162k miles

"Where are we going? And why am I in this hand basket?"