Have not seen the #77 Harness Jack before, what a great looking knife. I’m not sure any of my other knives would ever see any pocket time If I had one!Nice, I'm glad it worked.
Something I didn't mention: I stuffed bits of oil soaked tissue in the well, near the pivot. File a little, remove the tissue, test the blade pull, stuff new tissue in, repeat. Cuts down on the chance of metal filings getting into the works.
The knife in that picture is my #77 Harness Jack. I was mighty nervous about taking a file to it, but I really, really wanted to use the knife and be able to open the punch blade.
![]()