WTH causes that? It isn't the belt. It doesn't seem to be either of the plastic shrouds on either side. It's usually a fairly quick, light "tck-tck-tck-tck".
If I put my hand between the seat and backrest and put pressure between them it will usually go away. Also, I never hear it when a person is sitting there.
Could it be one of the springs inside? It's maddening I tell you - MADDENING!!
