Exracting Amp connectors
The first thing is to understand what the retention mechanism by looking inside as best you can or checking on the web with Google search. But, I believe these are retained by a barb on the surface of the contact, which is released by inserting a thin about 1/2" or so long piece along the side of the contact in a channel there. I make this kind of extractor by grinding down an end of a hacksaw blade - cheap and available tough but still not brittle material. Grind to about 1/16" wide tab 1/2" or more long, then carefully thin it out to fit down the channel. Don't let it get red hot while thinning or it will get too soft.