Hello Hepsibar

You should be able to calculate this from the spec.
On the lowest setting the bottom blade must not touch
the ground. There should be about a 3/16" gap.

[Linked Image]
[Linked Image]

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https://www.outdoorking-forum.com.au/forum/ubbthreads.php/topics/87958/ransomes-ajax-c1930s.html

Cheers
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Jack