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Required information

A spring $AB$ with $3\mathrm{.}2\frac{N}{m}m$ stiffness is attached to a cable at $B.$ The cable wraps around two cylindrical surfaces, and cable segments $BC,DE,$ and $GH$ are horizontal. All contact surfaces have coefficients of static and kinetic friction of $0\mathrm{.}1$ and $0\mathrm{.}09,$ respectively. The spring is initially unstretched.

NOTE: This is a multi$-$part question. Once an answer is submitted, you will be unable to return to this part.

Once the spring is stretched by $4$ mm $,$ determine the value to which $P$ must be reduced so that the spring begins to contract. $($Round the final answer to four decimal places.$)$

$P$ must be reduced to $*$