I recently bought a small Case sheath knife for $10. It's a pattern still being sold and the new ones sell for $49.00. I think it's call "Bird and Trout. In any event the leather washer handle is dark and needs some sprucing up. Before I do anything- is there a particular way to refinish a leather washer handle? Sand/scrap and varnish? Use super glue? something else? Thanks for any help.