Using the Wera 6004 Joker Small Self - Adjusting Spanner is easy. First, identify the screw size you're working with. Then, place the spanner on the screw. The self - setting feature will automatically adjust to fit. For efficient screwdriving, use the mechanical ratchet. Just turn it back and forth without removing the tool from the screw. When using the lever mechanism, be careful not to apply too much force suddenly. As for maintenance, after each use, wipe the spanner clean with a dry cloth. Store it in a dry place to prevent rusting. Don't use it on screws that are much larger than its adjustable range to avoid damage to the tool.