NW-7EX: How to remove the impeller screw
洗濯機用パルセータ-用ネジ [PF-3150 JCF]
The NW-7EX Screw
The screw is right-handed, so undo it with counterclockwise rotation.
You will need a PH3 screw driver head and maybe small spanner to help remove the tight screw.
* This is just an image of an impeller from the same maker but not the actual impeller of the NW-7EX.
The NW-7EX Plastic Cap
Removing the plastic cap will be difficult but you will need a flat head screw driver to pop it out.