Hello Michel,

I had cylinder movements with dark spots around the pins.  I bought
a rotating brush with brass fibers for my electric drilling machine,
then I brushed the cylinder with that tool.

The result was better than I thought -- No ruined pins !  The fibers of
the brass brush were thin.  Don't press too strong against the cylinder;
not too high rotation speed.

But, in order to do that you will have to remove the cylinder!  Then
the cylinder should be lacquered to seal the surface.

Have a look to the MM Digest from the 20th of Dec. 1996 and see what
Nancy Fratti has written: Subject: Re: Rusty Spots On The Cylinder.

Yours Hauke