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Author Message   Johnnyh Tinkerer Username: Johnnyh Post Number: 16 Registered: 06-2009 Rating: N/A Votes: 0 Posted on Friday, September 17, 2010 - 01:24 pm:    I find that '12BA' size screws are usable for many focus rings; I use the round-head type and cut the length to the required size. http://en.wikipedia.org/wiki/British_Association_screw_threads http://www.chronos.ltd.uk/acatalog/Chronos_Catalogue_Brass_BA_Screws_in_packs_of _20_297.html