Shimano HollowTech II Crank Bolt Installation Tool
thingiverse
The 17mm spanner or a 6mm hex key is designed for Tool1, providing leverage when dealing with stubborn bolts. Typically, crank bolts are hand-tightened, making Tool2 sufficient for the task at hand. Tool3 can be printed without any support structures. Choose the tool that suits you best to tighten the crank arm, ensuring it has no play yet not so tight that it presses hard on the bearings.
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