Brilliant Gadge!

I knew a 'farm boy' would know this!
Yes, sorry, the fingers were static. The sickle bar reciprocated.

I would like to add something on the Whirlwind using sickle bar knife segments.
This is so true - and it seemed so logical. I guess the blades could have been
reversed as well.

However, I currently believe the British Hayter was the 'grand-daddy' of the
slasher mowers that influenced Australian designs.

The Hayter rotaries - walk behind and tractor mounted sold here from
the early fifties (possibly before). These used sickle bar blades,
and Whirlwinds were good Hayter copies.

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All very interesting.
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Jack