The smooth ball handle is easy to grip and won't catch on other parts. Pull it back to manually retract the nose and make adjustments whenever you need. Since they weld in place, these spring plungers have the strongest hold for aligning, securing, and positioning components on heavy machinery. They can do everything from locking attachments on forklifts and holding dies in place on industrial presses. To change your setup, unthread the spring plunger from the old welded-on barrel and thread it into a new one.