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I think that is a major contributor. Find a solid metal surface and use a small 4oz. ball peen hammer and give it some taps. I usually give it some taps, and move the blade until I find a loose spot...

That's what I do put my thumb on top of the shank, using your pointer finger as the pivot rolling the shank/tang with your thumb on top. The rest of your fingers, use to hold the scales and...

This is how I do it - Move from the shoulder, lock your wrist, pointer finger on the bottom jimps, thumb on the top jimps and use your thumb to flip it (roll your thumb).
If your pivot pin is loose...