Clipping at 3% and 97%, for offset printing

Hi --- I used to be able to clip the ends of my greyscale images, so that everything from 0-3% would print at 3% and everything from 97% to 100% would print at 97%.  (Thus avoiding the dreaded sudden white areas in the skin tones). I did this using Curves, and it seemed easy enough, and I could put that into an automated batch and do a whole bunch of them at the end of the process.

Well, now, with the latest Photoshop, 2022, I'm having trouble figuring out how to do this. Curves doesn't seem to work the same way. And, I'm even having trouble searching for the problem and how to fix it because I'm not sure what to even call what I'm doing or want to do. Can anyone help? Very much appreciated ...