To close the loop, those who speculated congealed lubricant were correct. The senior curator applied more pressure than I was willing to. The latch moved, the cylinder opened. The latch loosened up with repeated movement. Curator said it felt like hardened grease. Thanks again to all who posted.
Yes, I meant the nut on the cylinder release. And as usual, I was wrong.
Last edited by Inusuit; 10-04-2018 at 04:11 PM.
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