I donate any tools that develop this smell. Life is too short… this is the kind of thing that makes it feel longer… not in a good way…
Any truck tools from the secondary market… those, I give to friends who are serviced by the truck. I have one or two Snap-on handles just starting to stink (sometimes after they start to turn chalky… they shrivel and crack. Almost as if a certain percentage of them evaporates out of their mass. It is weird to see. I would compare it to both melting and dry rot, but is neither. The chemical compound just breaks down in a gross way).
I still have tons of tools that could, at some point in the future, develop this. Some I would be sad to see go. The small xcellite nut drivers would be a loss. They are nice to use. You are definitely not going to over tighten anything with a tool this small.