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STEP 2
Connecting Left Cross Beam (Long Side)(D1) and
Right Cross Beam (Long Side)(D2) with bolt(H2),
flat washer(H4) and nut(H5), Connecting Left Cross
Beam (Short Side)(D3) and Right Cross Beam
(Short Side)(D4) with bolt(H2), flat washer(H4) and
nut(H5), tighten by wrench (HW1).