Water PUMP:

this question is about how to stop two bearings from moving sideways on a shaft that has to support a rotating impeller at one end; the bearings and part of the shaft are in a bearing housing. the shaft is also partly supported by the pump casing (in which the impeller is). I don't know if you can picture it but the shaft goes through a hole in the casing that is fitted with a lip seal and after that you have the impeller (on the shaft) i mentioned above.
our tutor said that having two circlips on both sides of the bearing is not very accurate(we only have our limited workshop with limited facilities). What about stepped diameters on the shaft?
Any other suggestions? I know its difficult to picture but any suggestions will be appreciated.
Thankyou.