I picked up a good condition Filarmonica not too long ago and I need a little advice on how to restore it. In terms of the scales, what should I do? I've already unpinned the razor but I don't know how careful I have to be about cleaning the scales since it has the Filarmonica name and logo on the scales. It is already missing a little of the lettering and I don't want to make it worse.

Also I noticed that the scales almost have like built-in washers on the scales. For those of you who have done work on a fili you will know what I'm talking about but basically the inside part of the scales isn't flat, there is a washer sized bulge where the pivot pin goes, so do I still need to use washers on the inside? I will post a picture if this is confusing. Thanks.