No, the follower does not lock down. The channels cut in the tool match the sides/rails on the magazine, so it slides easily and stays in place. See the back side of the tool. Some mag springs are so stiff that it is difficult to load more than 5 of the 8rds without the tool. Maybe all of them were that way when new?
You may be interested in the 'sticky' on mag tools, I think in the new collector's file. If not search for it.
FN
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