Anyone know where to find 0.1mm or 0.2mm stylus tips?

I'm about 90% of the way through building my 2nd generation 21st century Phonograph for playing Edison cylinder records (1890's through 1910's) in my system but have been stymied in my attempt to find 0.1mm (.004") and 0.2mm (.008") ruby, sapphire, or silicon nitride balls or ball tipped styli that I can mount in my choice of P mount magnetic cartridge to fit the Phonograph. Anyone who knows where to find these, or ellyptical tips in the same choice of materials, please let me know.
If there's interest, I'll be happy to post photos and technical details on the Phonograph when it's ready. With a little luck, that should be in a few weeks (maybe without stylus), and soon after that ready to add to my monster system, provided I can find and mount the required styli tips.

If you are in the USA---might try Vintage Electronics --601-264-4755 M-F 8-5 CST.
Ron Rich