How to clean a Warner & Swasey Musket Sight

[oldhoodoo1]

My 1913 has a small steel eyecup instead of the big rubber one. It has cuts in the base to allow it to be compression fit in the eyecup ring. Is this a commercial aftermarket part to replace the rubber eyecup? No markings. It's very well machined.

---------- Post added at 10:29 PM ---------- Previous post was at 10:23 PM ----------

How do you clean them properly so as not to damage it? My reticle is pretty dirty, it is also rotated a bit to the right, I want to try to straighten it in any event.

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[ChrisW]

I have a Model of 1913 Warner & Swasey and I think there is a part missing from the Windage Adjustment part of the mount.

Looking at the PLATE II sectional drawing of the Model of 1913 it shows a part number 54 which is missing on my scope. Does anybody know what material part number 54 is made from?
Best regards
ChrisW