This is a project that works very good on my knife, Victorinox classic, purchased in 2018.I have tested it on older knives with varying level of success. You may have to file it into shape...But it holds the angle perfectly.My knife is always razor sharp and ready for use.And yours can be also.
I tried selling this on Amazon... it failed spectacularly... 5000 EUR were lost experimenting with it... so... might as well share it like this.