On Monday, 6 January 2020 08:21:25 UTC, Robin wrote:
I've never opened up a HH but if you are going into the innards with
solder aforethought would it be practicable to get rid of the socket and
plug and connect your 5B PSU permanently?

That is my next cunning plan, but will make it harder to feed the power cable up any trunking or conduit as required.

Owain