Avoid a wrong match
- LRW L is long block;LRW itself is widened, distinct from narrow LRM.
- Rail length is not usable travel; verify both edge margins and block space.
- kN load, N·m moment and N·cm screw torque are different units.
- Component group codes change preload; do not assume random block/rail pairing.
- Complete combined precision differs from component precision options.

