Shifter flywheel?
 

While inspecting the shift linkage on my 06 CS, I noticed that the black plastic wheel mounted towards the rear of the transaxle was pretty wobbly. Parts list calls it a flywheel (98730305100) for ~$80. Not a budget buster, but I'm curious what the function of the part is. It's been superseded by 98130305100.
I've searched the net for any info, but came up dry.
TIA
https://cimg2.ibsrv.net/gimg/rennlis...95389329e5.jpg
https://cimg3.ibsrv.net/gimg/rennlis...0332748db3.jpg
https://cimg6.ibsrv.net/gimg/rennlis...d583b205c9.jpg