I have an Omas Extra that dates from the early 1990s. It is faceted celluloid and the cap ring below the Greek Key band is loose and falling out of its groove. Apparently the facets pose a problem for some repairers (as opposed to a round cap which I gather are easier to repair). Can someone recommend a repair person who can make this repair? I’ve been waiting almost a year for a well-known nibmeister/repair guru in Los Angeles to handle it but he is shortstaffed and I have lost patience. I really want this fixed up if possible. Thanks