I have a couple of belt driven linear actuators they use thk ssr20 bearing blocks and rail,

When I got them the moving stages of the actuator were connected to 3 bearing blocks riding on a single rail. I wanted to reconfigure them for my setup and I took the middle bearing block off the stage to use it on a support rail at the other end of the axis.

When I tried to put the stage and 2 remaining bearing blocks back on the rail there was slight difficulty as if by removing the middle block from the stage allowed the metal stage to warp slightly. ( I did not loosen the remaining blocks). The stage at this point made more noise while rolling on the rail.

If I loosen the two blocks from the stage the stage moves quietly, but when I torque it on to the blocks even slightly the rolling sounds much louder.

There is no significant increase in rolling resistance either way.

Is there a method to torque the bearings down properly?

Should I bother pursuing this issue?

thanks
pedro