Your tool might be too thick. You need to give it a good "push" to depress the spring that allows it to unlock. If you cannot feel the spring depress, your coathanger is too thick. Find another one that is thinner.

Also use a flashlight as J.M stated above to make 100% sure it is lined up. Assuming it is, either push harder or the coathanger is too thick...Or I guess too thin even? It's gotta be dead right diameter.

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