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Ah, I’ll reply to you 1st, as that is the piece of missing information I needed!

No, in fact, I did not realize the outer barrel is double-sided, with metal contacts on both sides. But, sure ‘nuff, there’s an outside sleeve (metal cylinder) insulated from an inside sleeve (metal cylinder), and then the center pin. 3 conductors total. It is a very simple yet clever and strong design that makes it nearly impossible to short out the supply with an errant or forced plug-in attempt.

So, I grabbed my cheapy meter and the outside conductor measures at 19.75 volts. I believe this supply will power just about any small project I might have needing a few amps at around 20 volts, without any trickery needed, and... these are also made in a 240 watt version... :-)

Thanks for the info!