A while back you posted pictures of your tow behind aerator. It pulled cores, broke them up in a mesh drum and then the little bits of dirt fell back to the lawn. Do you have any pictures of it on the net? I would like to build something similar this winter.
I don't see how you can built something like that from scratch. My aerator was made by Dedoes Mfg. of MI about 20 years ago. I bet there might be golf course in Ont. with one they don't use. Try getting a list of courses in Ont and sent them a letter.
This machine only works the next day right after a heavy rain when the soil is juicy. I have some pics on print I will find and scan.