The adjustable wrench can be found inside the station hanging from the steel cables. This tool can be used to hold and tighten any nut that can be found on a bike. To use start off my finding the nut which needs to be tightened and hold the wrench up to it. If the wrench does not go around the nut use your thumb to spin the adjustment wheel downwards. If the wrench is too wide to grip onto the nut properly use your thumb to push the scroll wheel upwards to make the gap smaller. Once the wrench is tightly secured turn the nut using the wrench to loosen it off the bolt or turn the nut right wards to tighten it.