A Mechanical Lifter is a solid metal cylinder with polished at contact surface. This means that the Valve Clearance needs to be adjusted periodically. These lifters are usually used in racing applications because they keep their tolerances and work well with higher valve Spring Rates. But on the down side, they take longer to get set up properly, require adjusting the Valve Clearance periodically and are noisier because of the Valve Lash (meaning the lifter will slam into the rest of the valve train and cause a slight clicking noise)(37*30.5)
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The purpose of Slider Kit is to gather common slideshow-like jQuery functionalities (such as news sliders, photos galleries/sliders, carousels, tabs menus)
When tracking mouse movement, you usually need to know the actual position of the mouse pointer. The event object that is passed to the handler contains some information about the mouse coordinates.