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you could try using the correct sized spanner!
But you can never really get any spanner tight enough. Especially on chrome or some designs of nuts with rounded edges. And soft brass will crush a little on edges that pressure is applied to if nut is tight. Brass tap spindles are good example of this.
I know I am a snob but be like me and get into the modern age with a Knipex self constantly tightening smooth jaw spanner.
I am more a technician and engineer, I hate adjustables etc, they slip end of, hence why I use spanners where possible. not everything modern is better imho 🙂
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