I was a furnace man for 7 years.
That for me was hard graft.
We used to make car parts, usually engines and heads for mercedes, viper, lotus, mclaren and allsorts.
We even mass produced all the Triumph motorbike heads and crankcases.
It was all aluminium, so we were required to fill furnaces, melt the metal, transfer, sample and modify, degass and cast.
None of the ladels were on cranes until we started doing the Dodge Viper V12, which took a lot of ally, so we were carry around these pots of molten ally between 2 people.
To complete one melt could take 10minutes to an hour, depending on how little the particular parts were. So triumph heads were taking an hour to cast, and in that time your sweating salt out onto your clothes.
And all for 7 quid an hour, with 60hr weeks
It did keep me mega fit though, and I was very strong. Often beating the 'carpet carriers' (our word for musculer prats on steroids) at arm wrestling, pushing and lifting.
Now my job as a HGV driver feels like a retirement job.