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6. Push new spring elements K and cover plate J on the spring element holder L. The bores on the cover plateJ and the spring element holder L must lie on top of each other. 7. Push in bearing bolt I in such a way that all 3 bores (bearing bolt I, cover plate J and spring element holder L) are on top of each other. 8. Screw in screw H. 9. Push aerator cylinder F on to the drive shaft. 10. Put bearing shell G on the aerator cylinder F. 11. Screw bearing shell G on to the lower side of the housing