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@Ultrarunner
Thanks for your reply.
I'll get some calipers asap and report back with measurements.
Since the headset was seized, I was planning on getting a new one. It's moving freely now, I've not managed to remove it as my adjustable spanners aren't wide enough.
If the headset is 26 tpi will it follow that the BB will be "odd" too?
I haven't removed the BB yet, waiting for crank extractor to arrive from ebay seller.