I haven't had a set of those on my bench in a long time.
I've always just swapped em out. BUT... thats not to say that they cant be taken apart.
I dont know that they are meant to be... but that doesnt mean that they cant.
But just like a watch... once you open it you're likely not going to get as good of a seal out of it ever again. Thats not to say you cant dip the thing in RTV, or paint 17 coats
of bedliner over it all to seal it up again.
In any case, i say give it a go.... worst case scenario you have to replace them anyways, and you're out 30 for a little bit of knowledge.
Good luck!....and be sure to let us know how things turn out.
(dont forget to snap a few pics along the way too!)