The other option is to get an adapter from the 3.5mm headphone plug to 2.1mm coax... or make my own short-assed fly-lead?
Also, you can use a Speccy PSU with a ZX81 (and suitable adapter), but not a standard '81 supply with a Speccy. '81 supplies are rated for 700mA, Speccy supplies for 1.4A.
(The PSU that comes with a ZX Printer is rated at 1.2A, which may be usable on a Speccy as the standard current draw from a 48K machine is around 700-750mA, but doesn't leave much head room for peripherals.)
The ZX81 power plug is merely a 3.5" mono audio plug, tip positive. Speccy plug is centre negative, outside positive - make sure you get this right or it can cause serious damage to your Spectrum!
I've soldered a new plug onto the Speccy and that seems to be reliably reading 14.xV, so I think there was only the one break in the line... we shall see when I set it up on the device itself. I'll go order a jack plug from this Buy it Now, erm... now?
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Here is one from eBay. Any decent electronics supplier will also be able to supply one for you.
Shame I couldn't get a gold plated socket, but as I had 20 of them in stock, it would have been churlish to order another 1-5 just for the gold plating