Replacing panel mounted MK sockets in a metal extension reel.

Sockets are MK 735WHI, and are the same size as those made decades ago. There is an ancient data sheet for the original ones here: https://docs.rs-online.com/739a/09007... which is dated July 1959.

Flex is 2.5mm² 3 core PVC. This is significantly larger than most extension reels available today which are typically 1.5mm² or even smaller. This can be used at full load while wound up, as the larger cable has a lower resistance, so a lot less heat is generated in it .

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