After you insert the nails/coat hanger/pins, you need to either push them all together towards the center or outward, away from each other, (can't remember which) as you pull on the radio.
If you want the "actual" tool, you can buy it from Crutchfield for around $1 or $1.99. Pretty cheap. They'll send you two of the u shaped tools. That's what I did after getting fed up using nails and trying to push all the nails at the same time while yanking on the radio.
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