Is it possible to install this rack?

[Operator7]

I just received the Axiom DLX Streamliner Disc Cycle Rack that I ordered, and there is a bar in the middle that is supposed to connect to the bike's frame (without having to install a seatpost connector). As a noob, I absolutely cannot figure out why this bar is shaped like this, and how it is supposed to connect to the bike frame and rack. Can anyone enlighten me please?

 

[Operator7]

Also, when attempting to use the two eyelets, the rack is higher than I would like. I would prefer to use the wheel nut as that is a good two inches lower. I do not have a torque wrench... would it be bad for me to remove the wheel nuts (to install the rack) and then simply tighten back by feel?

 

[Operator7]

Nevermind. As a noob, I did not realize that other bikes have the hole in a different direction. I guess I can't use the one arm, and must get a seatpost clamp.

 

[Tara D.]

I don't think it would matter temporarily to tighten the wheel nuts by feel but I would however use a torque wrench before riding safety first for me and I know I wouldn't be able to get them tight enough! Glad you figured out you will need the seat post clamp; can't wait to see it when its all said and done.