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@DoktorSpoor
Hi Hauska,
A9 is a good headset in the alloy version and will last a long time, but you have to be careful with any alloy thread... However they are still very cheap from either Spa Cycles or possibly Ribble.
Re-threading (if needed) will require a massive tap which will be more expensive than a new A9, which last time I looked was only £25.
Given that the thread is not too far gone you may be able to clear the threads with a piece of fine hacksaw blade (about 24tpi) by running it round the inside edge - be gentle!
If you have taken the rest of the headset off and fork out you'll find it easier to restart the top nut of the headset on the bare fork thread before re-assembly, check the fork thread too for damage just in case. Finding bike shop with a fork threading/clearing die may be easier than one with a tap, so give it a go as above first. By the way; dies=outside & taps=inside : )
Good luck,
DS
http://www.spacycles.co.uk/products.php?plid=m2b2s115p0