Modern performers much appreciate having the means to swiftly slacken or tighten the bow’s hair according to varying temperature, humidity and musical expression. Since most bows before 1750 would still have had fixed-frogs ('clip-in-frog’) a way had to be devised to enjoy the best of two worlds: a bow that retains its proportions, balance and percussion-point irrespective of adjustments to the ribbon of hair by means of an internal screw.  

These authentic bows were appropriately named “Fin-de-Siècle-Bows" when they were invented long ago. 
(or more exactly: "Archet mexicain de la fin du Vingtième Siècle”).

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