When you have done that a coupler is still preferable.
Have experimented with several types, the one on the extreme right shows the most promise.
The one next to it with the spiral cut works well, but is bulky and the shaft must be slide out to fit.
This one can be assembled is situ, is robust and allows a small amount of misalignment and vibration thus cuts noise down. Available through our friends at Aliexpress and Bangood
The others all have failings. The traditional Hookes joint style vibrate, wear and are noisy
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