Lost key to this lock

A quick learner from Tampa FL says:
Is it possible to just replace the key cylinder?
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Bob from SWISCO responded:

Thanks for posting. I'm afraid I'm not certain if we have a replacement for this. Look at our 30-123; a key cylinder such as this might work for you, but keep in mind this is for storm doors; so in your case I can't be sure it will work. I recommend you talk to a locksmith. They should be able to lead you in the right direction.

How to flip a storm door mortise latch.
How to flip a storm door mortise latch.
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