CYCLUS TOOLS complete bottom bracket threading tool FRENCH 35 mm x 1 mm (1,378" x 25,4 tpi).
With the Cyclus Tools Threader for FRANC 35 (1,378" x 25,4 tpi) you'll generate optimal concentricity of the bottom bracket's thread. Insert both sides of the threader simultanly to avoid cant.
The usage of appropriate cutting oil is necessary.