I was googling around with exactly the same question. Too bad nobody posted an answer.
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Show posts MenuQuoteWhere the propeller shaft is supported by one rigid bearing only, the Bullflex coupling - with the centering ring installed - will function as a flexible ball joint.
When the propeller shaft is installed rigidly which means to say - supported by two (or more) non-flexible bearings - the propeller shaft should not be affected by engine movements. Therefore remove the centering ring in such an installation.