A "strong" flex disk may make the feel of the shift different. They cushion the shift, that is why the direction F to R of their installation matters. Upon examining the bolt holes and the surrounding rubber of the hole will help to see how they work. It's one of those things that makes a Benz a notch above most other cars when they are " dialed in and on the money".

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"Rudeness is a weak man's imitation of strength" - Eric Hoffer