I have a standard lamp consisting of a wooden pole and a plastic lampholder at the top. The on-off switch has jammed (thankfully in the "on" position) so the only way I can turn the lamp off is by turning off at the wall switch which is a bit of a faff. I removed the lampshade and bulb to see how to repair the lampholder but everything in the photo seems completely rigid. None of the components will unscrew from one another and the switch is jammed in its position on the right. There is a small rectangular hole on the left (and one at 180 degrees on the other side) below the black ring which I assumed would have a release device in if I inserted a flat bladed screwdriver, but again whatever I'm pressing against in either of the two holes won't budge. So I'm at a loss to know how to get the thing open to dismantle and replace with a new switch. Any suggestions would be most welcome.