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help on this spring analysis

Please see the sheet I have attached. Table shows my calculated values. See notes for formulas used and diagram to show application. Something about my calculations does not seem right and I think the error may be in my Solidworks simulation of the deflection. I used a 10 lb normal force to simulate the deflection and used the deflection to calculate the stiffness. From there, I calculated the Force based on the stiffness and the d2 value created when the media is installed. The holding force is the force in the x direction that pushes against the media. Does this method look correct?[ATTACH]711[/ATTACH]