Product review (1 stars): LIKE many of the posts regarding the Whirlpool Rack Adjuster
LIKE many of the posts regarding the Whirlpool Rack Adjuster, I too had the same issue with the prongs that hold the roller breaking after about 18 months.  I improvised and fixed the first one, but within the next 12 months the other 3 roller wheels fell off due to the plastic clips becoming brittle and breaking.  I called the Whirlpool service repair 800 number and was told the parts were out of warranty and I would have to pay for new parts.  I expressed my dissatisfaction, and advised the Whirlpool representative that the roller clips were obviously defective, but again was advised that I would have to pay for new parts.  I then insisted on talking with the supervisor, and was transferred to a manager.  The manager agreed to send me new parts at NO Cost.  The manager also stated that the replacement parts being shipped were a new part number, so therefore an "improved" part.  Hummmmmm  To all, call Whirlpool and insist on new parts at no charge.  Whirlpool owes their customers at least that.