So I put both the Mexico and the US Nicholson through their paces on the KnotKlipper. First off let me say that this is some tough steel! Looking forward to dipping it in some wood real soon. She's shaving sharp now! Unfortunately, I wasn't able to remove all of the pitting from the bit since it was just too deep in a few places.
I must say that the warning I got at the hardware store rang true. The Mexico Nicholson dulled incredibly fast. I noticed the US Nicholson dulling out a bit by the time I was done profiling, but not nearly to the extent of the Made in Mexico version. I alternated between the two files from one side of the bit to the other, with a consistent number of strokes, so neither file, nor any one side, was given more treatment than the other.
Pictured below is the Mexico model on the left and the US on the right. The lighter areas on the file show where the teeth are dull. It's much more noticeable on this side than the reverse, although both sides of the Mexico model dulled considerably faster than the US one.
Here's the reverse.
Needless to say I'm a bit disappointed with this. I've been using Nicholson files for years and would love to keep buying them, but it might be time to look into some other manufacturers, or at the very least specifically requesting the US versions at the hardware store. With that being said these are probably still OK for a little woodworking. I've also been thinking that now would be the perfect time to build a forge and try my hand at making some knives out of the dull ones

I must say that the warning I got at the hardware store rang true. The Mexico Nicholson dulled incredibly fast. I noticed the US Nicholson dulling out a bit by the time I was done profiling, but not nearly to the extent of the Made in Mexico version. I alternated between the two files from one side of the bit to the other, with a consistent number of strokes, so neither file, nor any one side, was given more treatment than the other.
Pictured below is the Mexico model on the left and the US on the right. The lighter areas on the file show where the teeth are dull. It's much more noticeable on this side than the reverse, although both sides of the Mexico model dulled considerably faster than the US one.

Here's the reverse.

Needless to say I'm a bit disappointed with this. I've been using Nicholson files for years and would love to keep buying them, but it might be time to look into some other manufacturers, or at the very least specifically requesting the US versions at the hardware store. With that being said these are probably still OK for a little woodworking. I've also been thinking that now would be the perfect time to build a forge and try my hand at making some knives out of the dull ones
