Keyway of mortise lack

A quick learner from Minnesota says:
Do the latch lever and the tail piece from the cylinder lock meet in the middle of the mortise lock? How do I measure how much to cut off the tail piece?

Winter is coming to MN and I need to get this handle set for the patio door finished.

Thank you.
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Bob from SWISCO responded:

Check out the video below. While the key lock shown here has a housing, the principles of installing the key lock and cutting down the spindle are the same. 

How to Install a Key Lock on a Patio Door
How to Install a Key Lock on a Patio Door
VIDEO
WATCH >
Legacy Patio Door Handles, Locks & Spindles
Legacy Patio Door Handles, Locks & Spindles
GUIDE
READ >
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