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Thanks for that Mark, from looking at the drawing I thought it should be possible if somewhat awkward. Will give it a go and hope that my bushes are the right way round. Have got a new set of pulleys and drive belt, so no probs to grind off old bolts if necessary.

Question to Mark. If the bearings had been installed correctly, should it be possible to replace them and the drive pulley without lifting the bio disc out of the tank. Our unit is working, but the bearings are quite worn, have obtained the replacements and am considering how best to tackle the...