Disappointed
Both of the screws are missing from the steel lock insert.
Email sent to Roger.
I hope everything will be OK.
All is relative. I tried cutting the same food - apples, pears, bread with Koster in 3v and Millie in M4. Both knifes were treated a couple of times with Tuf cloth and the 3v blade showed no visible discoloration but the M4 had several rust spots. Our grandparents had no choice but I personally prefer more stainless blade on an EDC knife. With that said I will still use the M4 Millie until I can get one in S90v or ZDP 189
You did something wrong. My guess is you "treated it a couple times with Tuf cloth" while it still had acidic juice from fruit on it. Tuf cloth or oil does not stop or prevent actual rust. it simply acts as a protective layer so that things that DO cause rust don't easily come into contact with the steel. Steel needs to be cleaned of moisture or acid before you apply these protective methods, or else rust will simply form underneath it all.
It seriously is ridiculously easy to keep these rust free unless you are seeing some REALLY wet use constantly, like out on a boat in the rain.
Trust me, I, and many others have used much more rust prone steels for a lot wetter/dirtier work than cutting up some fruit and had no problems. Like 1095 or whatever Opinels use. Those two steels will seem to stain if you look at them wrong. M4 is way easier to take care of.
I wish the explanation was that simple. I always clean and dry the blades before applying Tuf cloth. Below is a picture comparing Koster in 3v vs. M4 Millie. Both knives were used to cut apples and other fruits but M4 seems to be leagues ahead of M4 as far as corrosion resistance is concerned. I do not care for the cosmetics but I personally prefer to spend less time cleaning the knife after each use, understandably other peoples needs and use may be different.