key lock install question

A home owner from Runnemede, NJ says:

I have recently followed instructions and installed the #82-310 key lock in my existing estimated 5yr old handle & mortise lock. It completely fits in my handle & mortise lock, no problems there.

However, this new key lock seems to need to make a full turn to lock and/or unlock. But my mortise lock seems to only need a half turn to lock and/or unlock.

I am sure the tailpiece is at size.

Can you advise?

Thank you,
Ted & Kathy
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Dave Sr. from SWISCO responded:
I'm not sure what the problem could be. Try flipping it around. It's possible that it is currently installed upside down. If that doesn't work, let me know and we can work from there.
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