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Shimano STI Tiagra Shifter

Hi all,

Left hand Tiagra shifter ST -4500 has broke on me today. (2 speed).Anyone have one, or a pair ( for 9 spd) that they want to sell? Or any 105's ?-

It is the ratchet that holds the indexing that has broken, so I would even be interested in anyone who has a malfunctioning donor one that possibly has that part in tact??
Looking to do anything cheaper than pay the price bike shops want . The part that broke was held by some flimsy looking plastic..........

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