Hello bellarinelawns and aussietrev

I hope something can be done here.
Gilson was such an old USA company that expired with a takeover in the late 1980s.

The Gilson was distributed in Australia by Rover mowers in the early 1980s.
However they remained branded as Gilsons.

We would need to know the model number to investigate more.

http://www.outdoorbeltinfo.com/gilson.html
https://sites.google.com/site/rustytiller/manuals

Hope this helps.
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Jack