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Or mineral oil I suppose. That seems popular around here especially for eating knives.
I have 3 Opinels and none of the blades will fall open or closed by themselves.
Obsessed, thanks for the snap-ring pliers tip.
Put it in the bathroom. Take a really steamy shower. Keep the door closed and let the wood swell a bit.
Pack the joint full of Vaseline, open a close a few times, then wipe the excess out with a paper towel. That's how Carl did mine. It works great. Apparently that's how the French actually do theirs.
I hope whoever finds that Opinel tells us whether being baled in hay cured the wobbly blade problem.