Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to clean a penny board [title] Use a 13 mm socket to remove the wheels. [step] Use a socket wrench with a 13 mm socket to remove the nuts that hold each wheel to its truck. Between each nut and wheel will be a small washer.

Ending1: The plus of the washer is that it can be less slippery, will help loosen dirt and rust, and will keep your stock from getting into the trucks. [substeps] If you need to use more than one set of lug nuts, you may want to just use 1 for each wheel. Ending2: Another washer will be between the wheel and the body of the truck. Take care not to lose these small parts [substeps] Skate tools will usually feature a 13 mm socket, as well as the other sizes you will need to disassemble a penny board. Ending3: [substeps] A very small washer should only be inserted into the bottom of the 10 mm socket. From this tool you can use a phillips head screwdriver to loosen the wheel. Ending4: [substeps] Again, make sure that the socket cannot be moved; that will result in scratches and fractures. Be particularly careful, as the socket may get hard so you must set up fast.

Answer format: ending1/ending2/ending3/ending4