Product review (5 stars): PLUG 'N' PLAY, Frustration-Free!
The auger drum that moves the ice to the chute was broken, and I tried to replace the single broken part.  Unfortunately, it seemed to be attached to its shaft via interference fit, and I lacked the array of clamps, vises, add pullers needed to swap the cheap part.  Paying for the plug 'n' play complete tray assembly was money well-spent in terms of frustration avoided.