I if the blue loctite does not work I may put a small thin rubber washer between the ball and the mirror. Spending anther 5 cents is nothing considering what it has saved me, $150 for pretty much the same ones.
UPDATE: I had the glass from both mirrors fall out on me. I still think the above works well. Just be sure to add some extra glue to hold it in. They use a cheap clear approx that has the same consistency as hot glue. If you buy pop out the glass and use something that drys with more of a silicone/rubber cure.