Hello mikeo

Yep, it's amazing how lawns can be improved with regular de-thatching.
Here is a post you might be interested in:

https://www.outdoorking-forum.com.au/forum/ubbthreads.php?ubb=showflat&Number=64804#Post64804

(One of the cartridges may be cheap enough for the components you need)
Please keep us informed of any progress.

Hope this helps.
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JACK