Thanks Tobybul for setting me straight ...I have made a memory error ....
Sorry about the confusion on the puller....
I was thinking about a Volvo driveshaft I did recently.....
I will edit my post for correction....
No such internal disk on the Benz driveshafts...
But if you ever do a Volvo this is something to watch out for....

I think the description of notchy means as you move the u joint through its range of motion...you may feel (detents) in the arc of movement due to needle bearing/shaft wear that has occured in these locations....

Sort of like volume control knob clicks or notches on big home stereo receivers as you adjust the level up or down........

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1978 Yellow 300D (The Mustard Toad)
1980 Blue 240D (The Iron Toad)
1989 Grey Mitsu.4WD Mighty Max Pickup (Needs a Diesel transplant bad)

(Open the pod bay doors HAL)