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To reinstall the X clamp, first start by attaching two corners to the posts on the heat sink.
While holding the third arm of the X clamp down against the post attached to the heat sink, use a small flathead screwdriver to pry the X clamp away from the heat sink post.
As you pry, press down on the arm of the X clamp until you "walk" it down into the retaining groove cut into the post attached to the heat sink.
Repeat this process for the fourth arm of the X clamp.
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