Originally Posted by CyberJack
[quote]
In 1968 an historic Code of Safety was implemented - and led by mower
manufacturers.
The reversible blade carried a problem - most folk would save money by
reversing the blade without replacing the fixtures.
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Jack

I'm learning a lot from this forum. Jack, I could be wrong, but aren't the only reversible blades these days found on the much larger agricultural drum mowers/slashers? Also, my Bunnings-bought garden shredder/mulcher has reversible blades. I had one of these blades fail one time but luckily the screw had held it in place and I noticed the crack in time.

I believe the new-fangled "robot" mowers coming from China have double-sided (hence "reversible") blades too. They look very similar to shredder blades.