I'm interested to see if you find a source of these tapered nuts.
They are tapered to keep the arm moving with the spindle and as far as I can tell, the wiper arm will be useless without it.
My drivers one is almost unserviceable after I had to nearly destroy it to get it out (previous owner overtightened excessively). I had a search last year but couldn't find any so had to reuse.
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