1. First install the adaptor base in the base screw, put the small black gasket into
the base screw, and finally tighten and fix it with the nut; Finally, assemble the soft
rubber back into the adaptor base.
2. The bases direction can be installed forward or Reverse.If the base installed
foward,then the length distance between two bases are longer. If it installed
reverse,the length distance will be a little shorter. The base can also be positively
loaded in one direction and negatively loaded in the other. The base direction must
adjust according to the width distance between two rain gutters of car roof.