Hi Ian
Just picked your thread up.Please think about what I’m going to say,You said the improved was adding a blade to the cutting cylinder,you are right there but not because of grasses here in the UK,When your machine is sat out in Tasmania!.They altered the blades for New Zealand,their grasses have the same characteristics as ours. Coldwell sent many,many machines to your part of the world,far more than here.The reason is there was a tie with Shanks of Arbroath Scotland.
If you need anymore help with the Coldwell,you may email me direct,through this site
Kind regards
Andrew
Archivist
The Hall & Duck Trust