Drive Shaft seized on the final drive splines

[Grumpy Goat]

UPDATE:

I am in the middle of the job right now and can confirm that on the 2016 R1200RS there is a groove on the front spline only, and there is no groove on the final drive spline. So the microfiche diagram above is the same that is on my bike.

Moreover, there is no groove on the inside teeth of the front coupling, so the circlip only fits into the groove on the spline and relies on a "friction fit" against the teeth of the front coupling ...? That low resistance is for what? As the swingarm moves up and down the "grip" provided by the circlip should resist nothing ... seems useless to me.

The problem I have is that I don't know where my circlip is. It was not on the front spline and it was not in the front coupling. It may have dislodged when I pulled out the shaft and is lying somewhere inside the shaft housing.

This is a PITA since I fought to get the front coupling back on to the front spline, now I have to pull it off and go searching for the circlip with a magnet. All for an apparently useless part ...?

There will be a video of the high points of the job.