On that crankset there are 2 allen screws one a 10 and one an 8 you tighten the 8 and then lock it im place with the 10. 8 and 10 denoting allen key size.
@Brucy started
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On that crankset there are 2 allen screws one a 10 and one an 8 you tighten the 8 and then lock it im place with the 10.
8 and 10 denoting allen key size.