I was convinced that my sample has beryllium cantilever. By
beryllium one can see something like ''peel off'' (by paint). I don't
believe beryllium oxidise. But my my check today I think that Lew
is right because the cantilever looks like boron (aka ''black'').
For the function only the stylus is relevant. Diamond
certainly does not oxidise. So cleaning the stylus in ''ordinary
way'' will be sufficient. For ''esthetical reasons'' one can try to
clean the cantilever also but should use soft brush.
By beryllium cantilevers in particular those which are ''tubular''
those (wands) are very thin. So the risk of breaking real. My
idea is to use thin layer of glue in order to keep the ''peel off''
parts together and increase the rigidity of the cantilever.