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Screwdriver blade removal


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I have lots of screwdrivers.  A few of these ancient K&D screwdrivers have a different method for holding the blade (they do not use a set screw).

I am not sure about how to remove the blade.  My suspicion is that I need to expand the slot to release the blade, but I don't want to try this without some confirmation.

Ideas?

2021-02-28 08_36_36-Photos.png

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