ATX4VC voltage conversion board by DekuNukem, a 7P VH 3.96 female connector, and some lengths of 18 gauge wire.
New motherboard connector suitable for Apple ][ series computers as well as Acorn BBC series computers sourced from eBay.
2 pin plug sourced from a Microserver power supply fan, soldered to some lengths of wire for the power switch.
And a piece of insulating plastic salvaged from an old power supply cut to shape and holepunched for the standoffs and power switch wire passthrough.
The original PSU contents.
And removed, almost completely non destructively. I had to cut one wire, and crimp on insulated spade connectors, essentially making this process easily reversible.
Mounted in the original PSU enclosure with 2mm PCB standoffs.
Wire passed through the casing using the original retainer.
Streacom Nano 120W PSU installed. (Overkill, but I got a good deal on one open-box)
Also a new power switch.
Cable management, and ends crimped on for the power switch.
New C14 connector cut so that the face plate can be used on the outside of the PSU.
Tufnol sheet to be cut to make the plate to mount the 12V barrel connector.
Installed, and finished.
Installed back in the machine.
vs. how it used to look.
How the power connector now looks.
vs. how it used to look.
This fixed my cold booting issue, and the unreliability with powering the disk drives. The machine is now almost entirely functional!