Different Clearance Levels
Alexander's special seesaw was made all the more special as it was not in any way restricted to just papermaking.
And in fact could be used to grind a variety of other substances, which given how expensive and location dependent the ball milling machines were, as it was required to be built near a water source or necessitated the construction of aqueducts to bring the water source near it, was a heaven send substitute.
Additionally. with its paddle-like mechanism, one could use their much stronger feet muscles to do the work, which was much faster and safer, as the toes were literally 10 feet away from the mallet.
Hence with this device lowering the physical requirement for the job of grinding, even women would be employed, thus freeing up the more precious resource, i.e- men for far more labor-intensive work.