Knomix Plastic Hinge Swivel + XM4 U Shaped Metal Hinge Lock Grove Replacement for Sony WH-1000XM4 WH1000XM4 Headphone (Gold-Left)

Works as advertised and the video was very helpful.

The process for fixing this is a bit tedious. Please be careful when taking off the gasket rubber ring. Also I think that the screw driver should be a little bigger. When screwing off the motherboard you might need to press hard and trun the screw at the same. Other then that everything is good.

The part fit wellphillips head screw driver was not great, at times it was very hard to use as it stripped the screws and the head started to shave off metal at the tip.The other tool, plastic and flat, pointed at one end, was quite helpful in prying the parts.This is a long drawn out repair for a hinge. But this part does fit and works as expected. I'm glad someone decided to sell these parts and a video is available for the repair because of the design defect in the headphones. You will not be disappointed with the part fitting and doing exactly what it needs to do which is swivel and bend. I will update after further use as to durability and longevity. Thus far I am happy with this purchase. I recommend if you are not shy about working on your electronics.

The screw driver is not very good, stripped one of the screws on the headset so now I am stuck and can't proceed