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Push joints into the plates of the crossbar and screw at each side 2 hexagon socket
countersunk flat head screws DIN 7991, M8 x 20mm through holes of joints and
crossbar.
Then stick uprights on joints and screw 2 hexagon socket countersunk flat head screws
DIN 7991, M8 x 20mm into the joints. Adjust joints, unscrew screws if necessary and
then tighten all screws again.
Note:
For stability reasons this execution is
constructed with small tolerances. Therefore
we recommend to use a screw clamp (if
necessary) when mounting the joints (see
right picture).
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