dishwasher removal of tower spray from rack

Dishwasher Repair
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1

Appliancepartspro.com part numbers rack assembly lower- ap4114739 and tower spray- ap4113834.

Question is: How do I remove the tower spray from the old rack assembly and install it on the new rack assembly with out breaking it.

Thanks

2

Here is a different model but the tower looks the same.
Hopefully it will help
http://www.servicematters.com/maytag_library/docs/16010622.pdf