Product review (1 stars): ... LOW SCORE was that upon installation the "wheels" squealed TERRIBLY. The plastic material was different than the original
The reason for the LOW SCORE was that upon installation the "wheels" squealed  TERRIBLY.  The plastic material was different than the original.  Apparently harder and "dryer".  Dragging one's finger across the original part was smooth with no resistance.  Dragging one's finger across the replacement parts had "drag".  Had to reorder - hopefully the next replacement parts will not do the same thing. After looking and wondering, the sound was generated by the spring and the string attached vibrated, so I have to wonder if it had to do with the groove on the wheel grabbing and vibrating the string.