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@Jumanji
Thank you, Dogtemple and 91010.
It’s slowly becoming clearer.
There’s nowhere local (Norwich) who has the tool to carry out the hinge insertion. So I would have to send it off (£20 postage at a guess) plus parts and fitting (£40 apparently).
To do the work myself will cost slightly less, and I’ll be slightly more knowledgeable in the world of flanged hinge pins! I am a patient and logical, mechanically minded/experienced person, so I’m not going to rush this and do it badly. That’s why I’m gathering all the info I can before attempting anything. And anyway, I have a week before it comes back from the powder coating shop... plenty of time to prepare!
I’m imagining a G Clamp and a ballbearing (of a size very slightly larger than the eventual flange opening) to squash the flanged part evenly into place. Obviously this is going to be a homemade, one-off setup, so my invented tool doesn’t need to be super convenient to use.