... parts, one end of the connecting shaft eccentric gear, central part of the lift plate; and ... the lower part is the cover, the Eccentric gear sets exposed at the lower end of cover ... left sleeve, 3, the right sleeve, 4, eccentric gear, 5, lift plate, 6, helical gear, 7 pin, 8, positioning holes, ... simply press the lift plate 4 can be screwed into eccentric gear 4 interconnect 14 to achieve the purpose ...