One thing would be easy to do: make a protective cover from balsa-wood if you have enough room for it in its bag or your camera-bag.
Make it fit to size and than take out the wood at the knobs. Put an elastic band around it to keep it into place.

What I do with my Minolta Colormeter II is take out the battery after I have used it and put the battery into a zip-lock bag.
Works too.