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@Richard_Cheese
Like R-d-C says really - as it's alloy go easy on the HTFUing ;-)
If the thread is damaged in any way it'll be obvious to the naked eye.
I've actually got a set of forks at home where the steerer has been extended and this presents a similar problem, as obviously it is fairly tricky to extend a bit of threaded tubing correctly - might be worth checking that this isn't the case here...
Oh and TPI is threads per inch - bearing in mind an inch is 25.4 mm you're looking at a little bit above or below 1mm between 'peaks' on the thread depending on your threading type