The product initially seems of good quality, however due to very poor quality control

The product initially seems of good quality, however due to very poor quality control, one of the encoders is not usable. The axis is round and does not fit the notched wheel. Attached are the photos of both encoders, one good and one bad. We haven't even got to test anything so I don't know if the parts actually work. I can't even return the item as it has been shipped to me outside the states.

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