G'day Mowerfreak
A great memory there.
New information too; about a plastic nose cone on a plastic dress cowl.
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Is this what you call the mid arch base?

Yep, it's a term I use to better describe the historical changes to chutes.
It is my view that many mid-arch mowers had as-good performance as high-arch jobs.
What they lacked in chute height was gained in chute width.

Cheers
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Jack