NATO PSA Mersey lock cover cap

This is a printable cover/cap for the NATO PSA Mersey lock.
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updated January 16, 2026

Description

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This is a printable replacement cover/cap for the NATO PSA Mersey lock. I took rough measurements from the later variant of the original cover, which includes screw pockets that purportedly will work with the different Mersey lock variants in both the 14- and 10-lever formats. However, I only have the later 14-lever version and have not been able to verify the fit for other variants.

If anyone who does have one of those locks makes and verifies the fit or provides feedback, I can adjust the model and update this description accordingly. I'm also including the model files but buyer beware: I am only a hobbyist and my modeling approach is unprofessional at best.

I did not include the nub that projects up from the plate on the original covers as I wanted to be able to flat print the two pieces.

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The author marked this model as their own original creation.

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