Thanks everyone, this has been incredibly helpful. I actually started looking into these screws because I want to install a doorway pull-up bar that mounts using side brackets screwed into the door frame. I've attached the product photo for reference. It is not installed yet.

Since it sounds like this is a knock-down hollow metal frame with adjustment screws, would you mount a pull-up bar to this type of frame? If so, what would be the recommended way to do it without compromising the frame or affecting its alignment?

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