YOu may want to use crimp sleeves (WBT is one manufacturer). Slip the sleeve over the bare wire, crimp it down HARD, then tighten the set screws to the crimped sleeve.
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crimp sleeve should work just ok.
but honestly, if you are using crimp sleeve,
you might as well buy some low mass solder-type banana plugs instead. At least they are lower in mass, and you will be soldering directly onto it
With the locking bananas you have, you will need to crimp it onto a crimp sleeve than by a screw tighting down the sleeve. Signals are going through one more layer of different material. The locking banana plugs you have is not that good in quality. I don't think they are genuine Nakamichis either. Probably just some Taiwaness or Chinese immatation. A good soldering job should outperform the crimp-sleeve method.