The spray arm support broke off when I forced the bottom drawer out. (the extending jet thing hadn't retracted.

Whoever manufactures this part, hope they read this and strenthen this part. The very thin legs break very easily.

I removed the threaded broken-off part from the extension thing. The spay arm came off, since nothing was holding it on any more. I pried the cover off below that - 4 tangs.
Then I used needle nose pliers to unto the strange pointed nut that holds the spray arm support in place. Then removed the borken support, replaced with the new and reassembled in the reverse order of disassembly. Really pretty easy.