Looking for replacement turn knob and bracket that secures shelf to stand. Had this for some time. It serves it's purpose. Help!

The rack is very fashionable and this is the reason i purchased it. However its not very user friendly. The cable management area wont fit more than a couple of cables before it is full and having to fish the cables through is a severe pain in the @$$. I had to buy a new amp aswell as surround receiver becuse the shelf spacing would not work for my Denon surround unit or my niles amp. Definatly do your research before you buy and make sure it will work for your system.