Help - Can't Open A Northfield 77

I once did this filing method with a slim strip cut from one of my wife's emery boards. Much less aggressive than my watchmakers files. I used a matchstick or a toothpick - I forget which - to add rigidity to it when working. Took literally a couple of minutes and worked a treat :)

I use an emory board just like that to lower the kick on my blades. Go SLOOOOW and checking frequently. Works great.
 
This is not intended as a permanent solution. It's just a temporary work around.

To save your thumbnail, fold a business card in half and slip the "loop" that made into the blade well beneath the blade. Grip and pull up. Voila
 
could try a knife opener? Rough Rider has a nice one with red or amber jigged bone handle.
 
could try a knife opener? Rough Rider has a nice one with red or amber jigged bone handle.

I was just going to suggest this. Not a perfect solution, but I do carry one with my Washington punch knife.
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