I have a single handle moen shower Clear Crystal Plastic Acrylic knob. The Legend attachment on the knob keeps falling off. The prongs are all intact. I don't think I can glue it in without compromising access to the rest of the shower parts.

Hi Debbie...

If you use just a dab of clear silicone caulking it should hold the cap in just fine and still be easy to pull out so someone can access the screw in the future. Simply purchase a small "squeeze tube" and you should be all set!

Questions? Just let me know, OK?

Mark

Yep, my thoughts exactly. Make sure it is caulk and not adhesive