There's a great beautiful fix for this. You will need 4 paper clips,plastic weld,a razor blade, and a tool to take apart the headset. undo the screws holding on your slider remove it from the headset you can leave the wire attached take the paper clips and straighten them to the length of the slider cut and shape them to fit in the groves of the slider ok we are almost done now before you put the paper clips in the groves apply the plastic weld in the groves then press the paper clips firmly in the groves now apply another coat of plastic weld wait for it to some what dry around 15 mins or so and scrap off the excess with the razor blade so that it's nice and even wait for the plastic weld to cure around four hours for most(I'd wait a full 24 to be safe) put it back together and presto you good to go and if done correctly your headset should be 100% operational with you being able to adjust them like new. Now if you want to go the extra mile like me sand down your newly fixed headset in the repair area so it's nice smooth and uniform tape off around the area of the headset such as the ear piece and head band and use matte black spray paint to fully conceal the repair making your headset more sturdy then when it was