I have a vintage GE electric 27 inch drop in stove from the late 60's early 70's. I need to change the surface element but can't seem to find any instructions on how to do it. This is not a "plug and play" element like some are. I need detailed instructions on how to do this. I have the correct element available, but it didn't come with any instructions. My stove model is JM7400-7AV and when I search for that on the web nothing is returned that matches that. Can anyone help?