First place the rubber protection sleeve at each side of U-shaped tube, assembly 2 ends of U-shaped tube to iron plate of left and right stand column with M8*40 screws, lock with nuts(special attention, the middle screw hole of U-shaped tube point to the beveled up direction,U-tube should not trap the L iron.put on the above it's approved.down U-tube with foam ,and upper without it )
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