The 30-year-old house has very noisy particleboard stairs.
I have watched the YouTube videos and screwed treads to the back-boards and the risers, but I suspect that the screws, 75mm particle board screws, are not holding in the risers.
The timber looks and feels very dry.
I could cut the bullnose off the step to access the joint between the riser and the step so properly seal that and then add a new bullnose.
I had even considered partly cutting the tread, ever so slightly, just enough so that the screws that pull down the tread to the riser can successfully pull the riser down completely. The cut would only be at the very front of the tread.
What ideas does the Bunnings workshop staff have as being most suitable?