put some grease on the shaft. To get it back in, I have heard of people using WD-40 to squeeze it back in there by hand. I used a large hose clamp to squeeze the fins down, installed the impeller halfway, removed clamp, and pushed the impeller in all the way. Greasing the shaft should make it easier to get out the next time. Doesn't matter what direction the fins are going when you install, it will self-correct itself.
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