When a linear block is incorrectly removed from its linear rail, or too much force is applied, steel balls could fall out of the raceway inside the linear block.
This video shows the proper procedure of putting the steel balls back into a STAF Linear Guide Block BGXH20BN-N-Z0 STAF.
To prevent this, it is safer to transfer the linear block carefully onto a plastic rail or short metal rail temporarily. Watch this video on how to transfer linear block out of a rail properly.
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