when the barbican was going up in the 70's, the lighting for the underpass's was done in 32mm steel which had to be double set up and down many times (through boxes before each one) to follow the concrete mouldings, what a b*****r to bend all those bends.
All the vice and benders had hicky bars attached and an apprentice standing on the back of it trying to stop it flipping over!
I installed lighting in a tunnel, each drop was 32 or 38mm and had 3 sets as the corner had a lump sort of like a coving. I dont recall using language like b*r.
Most of our words started with c or f.
