That's a splitter, not a true riving knife. A riving knife moves up and down
and tilts with the blade, keeping a constant distance from the blade. This
requires an under-the-table mechanism that mounts to the arbor and is linked
to the height adjustment of the blade. Its not trivial and virtually
impossible to adapt to an American table saw. Its a machine shop job.

Bob

....and amazingly my lowly Shopsmith (the model 510 and 520, not the 500) has a
true riving knife as original equipment.

Dave Hall