After 15 years since installing the bath, turning the handle doesn't open/close the pop-up waste anymore.
Now I don't keep the pop-up plug in as I need a snap-off knife to take off. No idea if I wrongly adjusted the length of the plug screw or if it's the handle that is not working anymore.
It would be too complicated to have the whole overflow system replaced, and anyway I checked under the bath and it doesn't seem to be any leaking.
Any suggestions for a solution without expensive specialist plumbing help? A traditional rubber plug would do? Would a rubber plug without the traditional overflow match the current system? I wouldn't be able to remove the current handle, not to risk damaging the bath, I would leave it in and wouldn't touch it.
Thank you for your help.