I've got one of these. You can see the lens cover is screwed onto the body. What isn't as obvious is that the lens is two pieces.

The case may be watertight, but it's apparently susceptible to humidity, as it's fogged up between the lenses. If I can find the right size screwdriver I can try to disassemble and dry it out, but I'm not optimistic I'll get it put back together as tight as it is now.

Think this is worth trying to fix?

Might as well give it a shot. Not much downside.