The plates attach to shaft that holds the handle used to rotate the table.
The handle is removed, the plate is slid on and screwed into place, the sector arms are slid on and then the crank handle is attached.
Not at rotary tables can take dividing plates.
When I bought my table I gambled and bought the plates and table separately because it was about $50 less expensive. As it turned out they plates, sector arms and handle fit perfectly.
Ok, that all makes sense to me now.... Thanks