Removing wires from the plug

I'm not very good at explaining. A retaining "tang" needs to be depressed. I have an assortment of thin stainless steel windshield wiper inserts / reinforcements that I use for this operation. I file them down and bend them accordingly to slide into the plug and depress the tangs. You want to push the wire deep into the plug first and then slide the tool in to depress it.
Some one will chime in with some good pics of what I'm talking about.