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Aroogah-
I have a steerer for a 58cm(ish) frame that needs to move to a 49cm frame
You may find that cutting that much off the steerer leaves the butt very near the top, which means your stem quill insertion depth will be limited, possibly terminally. Best to check that before spending money chopping it down.
gbj_tester
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.