linear rail binding

[funkenpedro]

I got my hands on a belt driven actuator. It has thk sr20 rails with 3 blocks. The blocks are mounted on an inch thick piece of steel. In my infinite wisdom and desire to use the blocks on another rail, I removed them from the steel mount. When I put them back on the mount and install them on the rail I now have some slight binding.

My question is - how do I get rid of this binding?

I've tried installing the three blocks on the rail and then fastening the mount to them by incrementally tightening each bolt (there's a total of twelve) as I force the whole assembly laterally by hand against the rail in an effort to line them up.

Do I need a torque wrench for this?

Could this big heavy piece of steel that is my mount actually be bending when I tighten the blocks to it?

Thanks for any advice.
Pedro