DOUBLE ROLLER SCREENING TOOL - What's it used for, and how?

A quick learner from Oregon, usa says:
What's it used for, and how?
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Paul from SWISCO responded:
The 75-016 is used for rolling screen spline, or the old style drop in glass spline, into the screen frames. One wheel is convex to press screen wire into the frame and the other wheel is concave to roll screen spline into the frame.
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