Product review (5 stars): Whirlpool or KitchenAid Top Rack Repair Kit
I recently used this kit to replace the top rack adjuster assemblies on a Kitchenaid KUDS30IXBL0 dishwasher. The original design had inferior plastic axel assemblies that broke and caused the wheels on the top rack to  drop out of position and jam.  The Whirlpool/Kitchenaid company offers the W10712394 kit which provides all the parts to replace the top rack adjusters (both left and right sides are included in the kit along with retainer clips, etc).  The instructions included with the kit I received were poorly written and not well illustrated (small dark pictures and confusing text), but do a Youtube search for W10712394 and you will find a video that is more than adequate for a person with average mechanical skills.  Also, you will need a T15 torx screwdriver (not mentioned in the instructions with the kit that I received), to secure the screws on the replacement assembly (you can purchase a T15 torx tool on amazon).  I recommend this kit rather than attempting to replace individual component parts. Using this kit you simply discard all the parts from the original adjuster assemblies and install the new assemblies. Took about an hour to do the repair after I found the Youtube video online.