I actually have the opposite recommendation. Using the tweezers to grab and place the screen is fine. But when you try to do everything with the tweezer, afraid of getting your fingers near it, can be problematic.
That's exactly how it was with me, when I clumsily tried to close the screen housing with the tip of the tweezer; the plastic tweezer and the metal housing apparently didn't like each other, the tweezer slipped, and skidded across the bottom of the KatzEye screen, scratching it. It was a light scratch, but very visible in the viewfinder.
Since then whenever I handle focus screens, I put on surgical gloves and do all the handling with my hands. That way I won't scratch the screen while having good tactile feedback of the housing door shutting tightly (or not).
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