I am looking for a specific piece to complete the restoration of an
old De Laval cream separator (model #18).  I need the bowl nut, which
holds all the discs (unsure if this is the correct term) on the center
piece.  I have the threaded piece, but have been unable to find a
matching nut or a machinist who can make the correct nut.  Apparently
the threads on the old equipment are not the same as standard threads
today.  I have been unable to find the piece I need on ebay or at
antique stores.  Modern farm supply companies don't carry it or
anything that would fit. Any ideas on where to find the specific piece
I need or someone who can make it for me?  They would have to be able
to cut non-standard threads on the inside of the nut.  A regular
tap/die set would not work. I found an old owner's manual for a
similar (same brand, different model) cream separator, so I would be
able to provide diagrams, etc if needed. Thanks!

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Clarification of Question by cbrooks-ga on 08 Jul 2004 05:51 PDT

I've tried 3 machine shops, none of them thought they could do it. 
I'm not sure why not.  I think it's the threads...

Any good machine shop could make it for you.  Try looking in the
yellow pages under auto machine shops.