Tall glasses leaning against the pivoting tines of the middle rack were making contact with cups in the outside rows of the rack causing tapping sounds. I was apprehensive that the contact would cause breakage of the glasses and/or cups over time. There were two tine row pivots on each pivoting tine arm so I added two more tine row pivots to stiffen the pivoting tine arm. Easy fix using no tools. No more tapping sounds.