Upper spray arm failure

Easy to solve!
(1) Remove the drawers to give yourself room to work
(a) bottom drawer just comes right out -- but you knew that
(b) Carefully unclip small plastic retainer caps at the ends of the metal "glides" for the top drawer. Then slide the caps out of the glides. Then remove the top drawer.
(2) Unscrew the "gear-like" plastic fitting into whose hole you were sticking your finger when you felt that small cylindrical ring.
(3) Now that you've got access to the ring, the solution is obvious -- use it to snap the upper arm back into the gear-like fitting. When you're done, the arm will rotate freely in the fitting.
(4) Put everything back together and enjoy the fact that you didn't have to pay some yobbo $75 to come to your hous and do this for you!

(HINT: When screwing the gear-like fitting back into place, use the old machinist's trick of pressing gently and screwing backwards until you feel a click. The threads will now be aligned for you to screw things together the right way. If you do not do this, you might experience frustration reattaching fitting -- since the piece it screws onto is spring loaded.)

I'm having the same problem with mine, but it seems that if you glue (or epoxy) the snap fit to the arm, it will prevent the arm from spinning like it's supposed to. Maybe the small mating part spins inside of the arm??

Discovered that the spray arm retainer is a screwed on part (I thought it was a glue on joint but kept twisting anyway) Found a loose part inside the retainer that presses into the spray arm and forms a radial gap that captures the retainer flange alowing the arm to spin. The small mating part was designed to be a snap fit into the spray arm hole but the fit became loose... so, I mixed up some epoxy and glued the two parts together. Works great!