Key cylinder for Pella storm door

A home owner from Northbridge, MA says:
June 10, 2014
Do you sell just the key cylinder for Pella storm doors I've lost the keys to mine, and was hoping to just replace that - rather than the entire handle set.

On your website you sell a Kwickset key cylinder w/ thumb turn (40-123) - which seems similar (based on the picture & dimensions), to the one I have now. Would that work w/ a Pella storm door?

Thanks!
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Dave Sr. from SWISCO responded:
June 12, 2014
I pulled our 40-123 from stock and tried it in a Pella storm door handle set, our 40-193. The 40-123 did work. However, the securing screw on the bottom of the 40-123 is centered in the cylinder housing 1-1/4" in from outside to inside. The key cylinder from the 40-193 has an offset hole for the securing screw. That hole is 1-1/2" from outside and 1" from inside.

Basically, what could happen is that the 40-123 will stick out 1/4" past your door on the outside and stick inward 1/4" on inside. I don't think it will hurt the operation of the lock, but it might look a little different from the original cylinder when installed.
A professional from California says:
June 12, 2014
As long as the securing screw lines up under the moving tab the same as the original, the extra length shouldn't hurt anything. Most of the cylinders I have seen protrude around 1/4" or more.
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