These two photos explain the mysterious gap in between the (straightened white coloured) over-arm and the end of the armature. The plier is holding the nylon disc which was located under the (previously bent) over-arm crushing against the cone on the end of the armature.
So what is in the gap? What is holding the armature?
A photo (or two) of a working pump would be enough for me to understand the design and enable a serviceable washer pump.
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