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Technical requirement: 1.the main support and auxiliary support must be perpendicular to the flat surface of frame 2.The extended shaft of main and auxiliary supports should be in the same axle and shall not pull the two shaft too tight. 3.Adjust the lift height for the main and auxiliary support to make the height difference within 5mm. 4.Keep the connection fastening for horizontal connecting rod and oblique connecting rod 5. When turn the universal crank,the high and low gear should be flexible lifting,the main and auxiliary support should stretch out and draw back at the same time. 6.Welding the handle clamp in a suitable situation, then put the universal crank on handle clamp,keep the gear in a state of mesh.
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