Flip kit bracket too short?

[stomper]

I installed an eBay flip kit tonight. Set the axle in the brackets and the axle rotates. The vertical legs of the 'U' shape don't reach the spring perch pockets. I contacted the vendor and they said, "These are designed that way to set the piñon angle. Once the u bolts are torque the axle will not rotate."

This sounds ridiculous to me! I would not expect the ubolt friction to keep that axle from rotating. I've done 3 others and the brackets lifted the axle off the bottom just a hair. No rotation. Am I wrong?