Thank you.
Not tested, only found that combination a couple of days ago. Might need an isolation sleeve, too, as it was pointed out (a large shrink tube anchored to the alligator screw would do it).
Meanwhile I was looking for an even simpler way to DIY a banana connector to casual wires. After all, alligators and bananas are middle-man pieces of metal. Would be better to connect the strands of the wire directly to the binding post. The sideways hole at the bottom of the binding post is one way to do that, but not very practical.
So I am looking now for methods to DIY a banana out of the copper strands of the wire itself. The idea is to use a round wedge to press the wires against the inner walls of the 4mm hole inside the binding posts. Pieces of round wood make a good wedge (tried chopsticks, toothpicks, matches, a twig, etc.). Maybe not the most elegant, but very firm contact.
Another way would be to use the sleeve from a cable of just the right thickness, and to bend back the strands of the wires, something in the style of second DIY banana from the right:
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Has to be something made out of common items, dirt cheap, and no longer than a minute to make.
Still looking for other ways to quickly and reliably plug a cable without using a banana. Has to be something that can accommodate with slightly different diameters of the binding posts holes, too, like the faulty ones in my DP832. Not sure which model will win in the long term.