Milky white deposit on cantilever/stylus of NOS Signet TK10ML, still in original box, etc.

My first inclination is corrosion. but I'm not sure how boron corrodes, I know aluminum will leave a white powdery substance behind for example. If its that old it will need to be rebuilt regardless as the suspension can-will decay over time.

one thought is to get a high power magnifying glass or usb microscope and take a look. Look to see how far up it goes on the cantilever if its all the way up into the motor assembly (coil) then its probably going to need a rebuild or possibly its now duff.

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.