Does the 82-051 lock automatically?

A quick learner from Las Vegas says:
Does 82-051 automatically click into place or do you manually do it? Can it be installed on the top rail as well?
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Dave Sr. from SWISCO responded:

The 82-051 does not lock automatically. It is normally used on the bottom track using one of the keepers listed (82-052, 82-053, or 82-054). You might be able to use at the top, but you will have to adapt it to be used that way. I've never tried it before so I'm not sure if it's possible.

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