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I can't remember the specifics (think I'll give them a ring tho just to make sure I've measured up everything properly) but the necessary chop down will completely remove all the threads that are currently there.. So a fair amount of threads need to be cut. It seemed like it was just a flat rate + the cost of shortening the steerer. He reckoned £15 all in all so I'd hazard a guess at £10 for the threads to be extended and £5 for the chop down.
Excellent. Out of curiosity - how much did you need the thread extended? What was the charging structure - flat fee or my length extended?