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Replacement Allen wrench.
In the drop-down menu, choose the color of the standoffs on your shedding device to get the correct hex key. The standoffs are the pieces that hold the two thin metal bars on the shedding device. The gold-colored standoffs uses the 7/64ths hex key and the silver-colored standoffs uses the 9/64ths hex key.
Gold-colored: 7/64ths hex key
Silver-colored: 9/64ths hex key