STEP 1:Assemble left support tube. (Need M8*45 2pcs、washer 3pcs
and Nut M8 1pc. )
STEP 2:Assemble right support tube. (Need M8*45 1pc、washer 2pcs
and Nut M8 1pc. )
STEP 3:Connect the left and right support tubes. (Need M8*45 1pc and
washer 1pc. )
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