What I tried to say was: if the six screws that hold the top valve assembly (handle, top, springs, seals, diverter) were to have been removed, the top of the valve removed (to change spider gasket?) and then put back rotated, the diverter (is that the right name) would be lining up to the wrong ports inside the multivalve. The drawing does look like it's keyed so not likely but it does look like it might be possible to install the handle rotated 180 degrees.