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Locktite is fine for a range gun/safe queen. It will NOT do for a carry gun.

As a result of two factors: The destructive nature of installation (this goes for any staked part) and the fairly low cost of a replacement, I would not even consider the idea of tightening up a loose plunger tube. Partial staking (where the process is incomplete) can be fixed. Improper or damaged staking trashes the part.

It's about a $15 part. If this fellow you found has a proper plunger staking tool (it might look like a pair of vise grips or a bike chain breaking tool), have him locktite and stake a fresh one.

Heck, do it yourself. The tool is about $30. You'll need a vise, a magwell filler, some wire and a good pair of pliers. If you make yourself a good pair of blocks for the vise, you can even do it without pulling the grip screw bushings (which you shouldn't do because they're staked, too). If the tube will actually come out with ease, all you need is the staking tool.

Oh, and whatever you do, don't try to pry the thing off the frame with a screwdriver.