I was adjusting the water level in my toilet and I think I opened the float adjustment screw too far. It seems to have come disconnected from something. Now the float falls as far as it will go and the toilet runs indefinitely after a flush even though the float is low. The screw twists but does not move up and down. There is some plastic dust around it - I think from the internal threads, they're likely damaged. For the time being I've wedged something under it and remove it when I need to flush.
I'm at a total loss as to what to do long term. Ordinarily in this type of situation I would try to nudge the screw out or at worst extract it with some pliers. But I'm not sure it actually makes sense to remove the screw in this case.