dont use the tools they send you...... either use a better quality allen wrench or cut off the one they give you and utilize a drill and socket set to tighten all of the screws. You will end up spending a lot of time if you tighten all of the parts by hand. The little wrench that is sent falls off frequently ,so use a socket ...  10 mm      do follow the instructions... make sure you do not attempt to tighten parts before this is assembled. Also set your drill to around # 9 on the torque so that you don't strip out the screws