N1KKO I have heard from one seller that the professional series base is overkill for domestic duties hence why he was selling it!
I imagine them to be quite hefty to push around without being self propelled.
This is why Victa should have continued with the excellent domestic thumb latch base and only sold the lift flap models as steel lower priced mowers.
The thumb thatch bases could have been easily updated with new colour combinations, wheels and engine covers to this day!

Ahh, if only victa had kept producing the thumblatch catcher series, they would be in better shape today!