They still do them, and I keep buying them!
But the nylon 'spring' cable clamp is a pain for v. large (and v small) dia. flex.
Perhaps not as robust as the original brick shape, but nicer looking?
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that brings back some memories.
when i was 7, i lost my dad suddenly in an unexpected accident.
we were living in Saudi Arabia at the time.
as you might imagine, the country has little to offer a single mother with no man to support her and we were swiftly deported.
shortly after returning to the uk, my mum's friend gave me several boxes of them, a screwdriver and a pair of wire cutters.
he taught me how to wire them, showed me what happens if you put the wire the wrong way round the screw stud.
explained why its best to leave a little slack in the earth wire and leave almost none on the live wire.
he explained the reasons behind fuse selection and left me a box of 3,5,10 and 13A fuses.
it gave me a challenge and a distraction from everything else going on around a boy grieving the loss of his dad.
I think it is probably the reason that i got into the field of electricity at a young age and why i still do so 40 years later.
to begin with i did stupid things, like try out a neon screwdriver in a socket, didn't fit, use a double socket adapter, did fit but blade joined live on one side and N on other side when i pushed it in. bang, flash, hide the screwdriver under the sofa and pretend it wasn't me!
or try to make an electro-magnet using a screwdriver and a coil of wire, smoke coming off the bed sheets because the wire was much to thick.
although now i do it for a living and rarely cause a bang or set fire to something!!