I know that TF’s can vary somewhat in blade thickness behind the edge. I’m also no stranger to thinning blades. On stones, thinning takes a good hand, time, patience and perseverance to get professional results. I have often thought that a belt grinder would be a better choice for thinning a blade, but never felt that I had the skills on a belt to guarantee good results. I then had occasion to watch this clip.
Ryan Swanson, the head sharpener at District Cutlery, is clearly (IMO) a savant on the belt grinder. I call him a “knife whisperer”. As part of my TF Chronicles work, I needed to buy and use a TF Nakiri. District Cutlery had a 195mm Maboroshi Nakiri for sale so I bought it and paid Ryan to thin it for me before shipment.
Here are some pictures of the results of Ryan’s work.
View attachment 175531
The top knife is a TF that I thinned. The second knife is the nakiri that Ryan thinned. The third (bottom) knife is a knife that another qualified person thinned. They all cut just fine with little wedging.
This pic is a profile of the blade on the nakiri after Ryan finished thinning it.
View attachment 175532
I don’t have a picture of the pre-thinning profile, but I think most would agree that the post thinning profile is spot on.
The last pic is of the mag strip that holds most of my TF Chronicles knives. Two have been thinned by Ryan Swanson. Three are un-thinned as purchased. The rest have been thinned by others. Can you pick them out?
View attachment 175533
All are excellent knives, but faced with the time and effort required to “tune” these knives myself, I’ll choose Ryan a hundred times out of a hundred.