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I was following the instructions on the video but then got stuck when it came to fitting the coupling adapter to the extruder. The Z screw is in the way. I have included some photos.
https://www.printables.com/model/473554-3dchameleon-mk2-ender-3-cr-10-style-mount
Simple fix... the instructions for that part suggest rotating it 90 degrees for that printer.
Bill