Using this chainring tool is easy. First, select either a 36mm spanner or a 44mm BB tool to use in combination with the DirectPlug Bosch gen. 3/4 tool. To remove the chainring from your E - bike, simply attach the tool to the chainring and use the spanner or BB tool to loosen it. When putting the chainring back on, reverse the process and tighten it securely. Remember to handle the tool gently to avoid any accidental slips. As for maintenance, keep the tool clean after each use. You can use a dry cloth to wipe off any dirt or debris. Store it in a dry place to prevent rusting. This way, your tool will last a long time and keep working effectively for all your E - bike chainring needs.