The internal screw fix is similar to the external screw, except it is not visible from the outside. Flaps come from the inside spine for you to thread screws through and clamp the hole punched paper in between.
The internal screw fix is similar to the external screw, except it is not visible from the outside. Flaps come from the inside spine for you to thread screws through and clamp the hole punched paper in between.
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