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@gbj_tester
Assuming he's filed a 27.0 steerer base down to 26.4 to fit an ISO crown race onto a fork designed for JIS, then yes, a file is the wrong tool. There's a good chance that the crown race, when fitted, will either not have the correct interference fit, or will be non-circular. In either case, you can expect accelerated headset wear and possibly difficulty in achieving the correct bearing preload to give minimal headset friction and minimal free play, leading to poor handling.