Dunno, I've found that sometimes the glues are stronger than the orginal material. For instance, epoxy or urethane glues are stronger than the wood they may be used on, and a repeated failure will occur in the wood--not between the glued surfaces in the glue.

Epoxy, urethane, superglue...The right glue will depend on what material that handle is made from. If it is a stress crack, drilling a small round hole at end end of the crack will also stop it from propagating further. Drill, then glue and plug the holes as well.

But first call the maker--some of them are quite generous about failed hardware and they might just send you a new handle for less than the price of the glue.<G>

I was susrprised, I called Gerber (plumbing) because I couldn't grab my shower/tub handles hard enough to tighten them with soapy hands. They said 'Oh, you must mean the Darth Vader knobs, that's what we call them because they look a little like a star wars helmet. We've had a lot of complaints about that, I can ship you a set of new larger knobs that should take care of that for you." Free!