Funny. I don't think I ever had worn bushings. I thought the bushing wasn't supposed to move from it's spot in the housing as the main shaft doesn't move -- just the middle part with the magnet and the propeller. That's why when I had to replace, it was always the shaft being worn down like a rod into a needle (old chinese parable). Or did I remember wrong? If I remembered right, then your filter housing is the part thats not holding the impeller properly anymore and needs work/replacement.
Yea, I think I got frustrated at my penguins for that very reason. Over the years, they just became prohibitively expensive. And really, if you're not using the biowheel, there's not much reason to be using it. Lots of better HOBs out there I bet. I personally have went to fluval canisters for other reasons but man, I take it for granted now that I don't have to buy any impeller shafts anymore. Those old marineland canisters used to be terrible about having to replace impeller shafts too! In retrospect, I think I had a misguided loyalty to marineland.
Interestingly, during that time, I noticed the walmart aqua-teks are what seemed to be like rebranded B stock penguins or commissioned from the same manufacturer. Same mold and filter size too. But you can definitely feel the drop in quality. I don't know about the situation now.
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