No problems at all, its my pleasure.Thanks for posting this, I'm always looking for ways to make an expensive hobby a little cheaper. I've gotten pretty good at re-purposing tools that work perfectly well at half the cost. Just adding the word "Luthier" to the name of a tool tends to double the price. For instance I recently noticed that the 'Gunsmith Hammer" in a small Lyman gun tool set I have is virtually identical to some of the expensive "Fret Hammers" for sale online with removable hammer faces in brass and delrin. I think I paid less for the whole Lyman set than a single Stewmac "Fret Hammer". Stewmac has a nasty little habit of advertising their products on Amazon as "Free Shipping", but all they do is take the catalog price (which does not include standard $11.00 shipping fee) and add that $11.00 to the Amazon price so.... no Free Shipping. Why engage in such transparent BS? That flat rate $11 shipping (might be more now) applies regardless of the weight or size of the package, so thats what you'll pay for a couple screws or a 5 lb tool. The quality of their tools is excellent, no argument there, but most of what they sell can be had for far less elsewhere if you are willing to search the web. They are usually my source of last resort, and only when I need something that simply can't be had elsewhere. One thing about the Stewmac files: they quickly clog on brass nuts, you have to file card them evey couple of strokes. Did you find that with the diamond files? I've heard of tricks like applying talcum powder as a lubricant of sorts, haven't tried it.
Putting luthier in the name of a product certainly doesn't justify its cost.
Nowadays, BS/Spin generates profit instead of a products quality and reliability.
RE: The files clogging up...these files seem to be quite good at ejecting material from the slot as you cut, reducing build up. When they do clog up a bit, a quick, hard blow and you're good to go again.
The build up happened quicker with the brass nut but it wasn't excessive and cleaning was only necessary approx' every 8 to 10 strokes.
I've never used lubricants before, i didn't know that was a thing to be honest.