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Denny,
I think I have this solved, it looks like it was one pump as the older one without controller, the shaft is sanded down and the newer one the drive unit has a large ovate hole. My hunch is sand got in this pump and sanded the shaft and drive unit and then in cleaning the parts got swapped. I am still working on trying to replace the shaft, you will need a new drive unit.
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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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