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I get a sore back from Lifting mowers on to my bench...... It's 30mm high...
G'day Speedy
30mm is just over one inch.

But you have asked a serious question. And I know what you meant.
I urge all folks to take this issue seriously.

I mean, back injury is common! Lifting is commonly exploited by companies, even today.
LRT amd M-F have suggested how this issue is 'tackled'. grin

Any repetitive lifting of heavy weight could cause long-term injury.

A good topic, in my view.
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Jack