yea man i just got some too, and i ended up just sitting a 4x6 speaker on top of my hood, worked out good wince the magnet sticks to the metal hood.
it seem like they were put together the opposite way, when u tighten the nut it keeps line from coming out instead of going in. i think if u could reverse them inside the plastic, they would work the way they need to.
good luck though man, i only paid like 11 bucks shipped for mine on amazon, so i guess i shouldnt have got my hopes up for 11 bucks haha