Marty in New Zealand, the epitome of perseverance in getting old machines running, like this mid 1960s Howard Rotavator GEM Garden Tractor

 
https://www.allotment-garden.org/rotavator-manuals/howard-gem-super-gem-manual.pdf

Howard seems to have made these from the early 40s until going bankrupt in the mid 80s  https://howardgem.webs.com/

http://www.guymachinery.com/historical-rotavators.html