Hi Lonesome, I checked the site and see that they are no longer offering the "safe file". Since they made it themselves, it was expensive. This is the triangular file I use when cutting the angle part of the dovetail:
https://www.amazon.com/gp/product/B001R1WZYK/ref=oh_aui_search_detailpage?ie=UTF8&psc=1I buy them by the dozen, use one new file per dovetail. The jig is so hard that it eats files. You can take one triangular file and power sand off one side of that file to make a safe file. The safe file is used after making the dovetail, with the jig off, to create a slight wedge in the dovetail for fitting the sight. I buy my sights from Track of the Wolf.
I hog out most of the metal of the dovetail using a flat file edge and finish with the triangular file.
BTW, since I use a bent piece of aluminum and small aluminum piece against the screw, no other protection of the barrel is required. The aluminum doesn't hurt the bluing.
Regards,
Richard