In this video, an operator is shown using an ES™ hand held capping machine with the optional lever activated base to tighten 20mm Nalgene caps onto 8ml bottles. An ES™ hand held bottle capper with lever activated base is an outstanding solution for tightening caps onto small, short, and narrow containers that are commonly found in laboratory and pharmaceutical settings. Small, short, and narrow containers are difficult to hold during the capping process. There is very little space for the operator’s hand to safely hold the container without being too close to the cap when the machine is tightening it. The lever activated base holds the bottle firmly during the capping process, so the operator does not have to.