Freestyle Pump washers for spacing

[Pablo]

Where are u guys getting washers for the pump to space the impeller off the stator? What size are they? How thick? I think they're 18mm ID, but don't know for sure.

 

[Penken]

the superjet manual says the impeller is a fine m20 thread.
that would mean that it´s a 20mm OD
maybe 19,9 or something like that. dont know what the clearence is on tha fine thread
so you would need a washer with an ID of 20mm. dont know the thickness. depends on impeller. why shim it? does it hit the stator?

 

[Waternut]

I think he's trying to unload the pump slightly without buying a new impeller.

 

[McDog]

I have some midshaft/coupler washers. Maybe it will work?