Replacing Support Arm Spray

The support arm spray broke on my Jenn-Air 730A. The support arm spray is number 39 in the diagram viewable here:

Pump & motor (dw730a) replacement parts for JENN-AIR DW730A Dishwasher - Undercounter | AppliancePartsPros.com

In my case, it broke where the 4 triangle-shaped prongs meet the threading, which screws into the nozzle center spray (number 33 in the diagram).

I’m curious how to remove the lower half of the old, broken support spray arm and replace it with the new one. I currently have removed the nozzle center spray (number 33), the nozzle “jump up” (number 42), and the arm spray (number 40 and 41). But I’m not sure how to remove the support arm spray and don’t want to damage something more important in the process.

If anyone can provide step by step directions, that would be very helpful.

Thanks.

Remove the filter cover (#48) and unscrew the spray arm support nut (#22).

Gene.