Where do Koralia 4 washers go?

[dangerbird]

Hydor sent me washers/spacers for my Koralia 4 rattling problem. On is white one is black. Anyone use these yet or know where they go?

Thanks

 

[ds4x4]

probably =you have to take the guard off and put the washers on the shaft between the prop and the inside of the guard. if your rattle is the prop skipping when plugging it back in or use with a wave maker.

 

[dangerbird]

I think one goes on the base of the impeller and the other on the front. But I'm not sure.