It cannot be use as you quite rightly point out, the cable pull is different on the 11 speed and the 4700 Tiagra derailleur.
Bummer. Thanks.
I thought the shifter was the deciding component and just pulled the derailleur the correct amount, but I guess the design is different.
@Tijs started
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It cannot be use as you quite rightly point out, the cable pull is different on the 11 speed and the 4700 Tiagra derailleur.