Manfred Jaeger´s Waterpump Impeller
Much better than the original one, 6 shuffles instead of 4 and the water displacing flats are reasonably bigger.
the new one next
to the old one
the impeller (click here for better PDF-file)
(a better drawing - higher resolution - to print out is in the "special files" cabinet)
and also the pulley was minimized (diameter bei about 15%)
