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Further update, once again a throwaway line in "Haynes - the bible" ie "....press in a new centering bush", leads on to even greater complications.
This front centering bush is relatively long, considering the short distance it engages into the front of the 'prop. So any misalignment would cause the front coupling out of line.
With profound apologies to anyone who makes a living out of this stuff (and therefore knows how it should really be done) I attach the picture of my homebrew alignment check.
On checking, the sleeve was well out of line. After careful adjustment (don't ask!) (ok copper mallet) it now runs straight to the limits of my test rig bodge up (I estimate 4/10,000ths ")
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W202-C220D ( UK ) 310K miles
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