Hi Mr Davis,
I have read a lot of your posts from the golden years here of 70s and 80s Victa discussion and am wondering if you personally are enthused with the Vortex?
They represented a leap forward in mower design with their radical all over cover and the ushering in of the Powertorque engine and revised (and arguably the most attractive) thumb latch catcher styling.
The much touted CSIRO cutting disc didn't leave a legacy however, as it required royalty payments from Victa, and they didn't appear willing to sustain that arrangement, so came up with their own plastic add on to their existing disc design to generate the lift of grass as the original had. This ceased quietly once the Mustang GTS stopped being made and we later got the four blade mulching disc instead.