I have a loose Moen tub spout with a diverter on the top of the spout. The caulk has cracked, and the spout moves when I use the diverter.

Hi Rick

Look under the spout and see if you see a U-SHAPED cut out in the spout. If you see the cut out then you'll need to get an allen wrench set and tighten the allen screw that is up inside the cut out. That should fix it... ;)

Mark