Height adjustment: place the screen frame flat on the platform. According to the substrate height or printing requirements, rotate the up and down adjustment handle to reach the appropriate height, and lock the height through the two rear positioning handles.Left and right adjustment: loosen the handle on both sides of the nose, and rotate the handle to move slightly left and right as required; When it is done, tighten both handles.Back and forward adjustment: first, slightly loosen the four red knobs on the front of the chuck, then loosen the fine-tuning knobs on both sides of the front of the chuck and make front and rear fine-tuning as required. After the fine-tuning, tighten the knob and tighten the four red knobs on the top of the chuck.When printing object is too small, adsorption maybe reduced, you can cover the holes to increase the vacumm power.We adopt advanced metal electrostatic spraying technology that can make machine acid and alkali resistance, corrosion resistance, rust proof.You can use it easily in a long-term; Item include: 1 set 16"x20" Three Directions Micro-adjustable Vacuum Screen Printer---006155