If it still fits fairly tight in the seat and the shaft has no rust, I would try tapping it in with modest taps (careful not to bend it) with a hammer and a punch, when fully seated it is about 1-2mm below the top of the well the impeller sits in. If it is rusted or comes loose, I would send it in.
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Roger Vitko
Tunze USA
"He's for every one of us, stands for every one of us, he'll save every man, woman and child in a mighty Flash!"
Current Tank Info: 210 gallon planted tank with Altum Angelfish
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