Using the Topeak Duospoke Wrench M7 / M9 is easy. First, select the right end of the wrench for your Mavic M7 or M9 wheelset nipples. Then, place the wrench on the nipple and turn it to adjust the spoke tension as needed. This will help you true your wheelset. When using the tool, make sure to apply steady pressure to avoid slipping and damaging the nipples. After use, wipe the tool clean with a dry cloth to remove any dirt or debris. Store it in a dry place to prevent rusting. The multi - size aero spoke holder is a great addition, so keep it handy for different spoke sizes.