i just changed the one in my 64 truck. first i unpluged the wiring harness and took loose the nut on the front side of dash that holds it in.then it can be slide out back of the dash this made it easier to work on. mine the key had to be in the off position. i then inserted one of my larger torch tip cleaners. it presses a small plunger type piston behind the hole- you can feel when it is engaging it. then turned the key backwards and pulled out.i put the key in the new one and it pushes in andtwists into place. hoggyrubbrer
