The Natural Philosopher brought next idea :
yes. Conical style clutches and IIRC centrifugal cluthes often used metal...
...ooi is this yours?

https://www.revillmowers.co.uk/spare...-kit-753-06346

That looks like it, but its neither conical or centrifugal. The clutch
is engaged by a level by the steering wheel, that spring then forms the
force to push the two clutch plates tightly together.