Using this TIG welding dab pen is easy. First, hold it just like you'd hold a pencil, with your thumb and index fingers. Let it rest in your hand as shown in the pictures. Then, insert the TIG rod from the back of the pen. The pen can handle TIG rods with diameters ranging from.030' to 1/8'. To make the wire move through, simply roll the rubber wheel with the tip of your index finger. It will automatically accept the rod, so you don't have to make any adjustments. Important thing to remember: never touch the smooth aluminum wheel while using the pen. As for maintenance, keep it clean and dry. If you notice any issues with the feed wheel or the o - rings, check them regularly and replace them if needed. Since it's made of cast aluminum, avoid exposing it to extreme conditions that could damage the material.