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@number6
to straighten steel forks - get the very ends (just above the dropouts) in a good vice that's well mounted (pad the vice unless you want scratches) so they are vertical - steerer at the top. now insert a long bar (peice of scaffold) betwen the blades just under the crown (again pad with some cloth where it touches the forks).
now you can use the bar to get the twist out - by going slowly and carefully and checking the results - often by eye you won't be sure but if you can find 2 long straight edges butt one up against the crown and one through the dropouts andsee if they're aligned - the longer the straight edges the more acurately you can see the alignment as any errors will be magnified by the leght of the edges.
eg. get a very long threaded rod in the droputs and butt a long straight ruler against the crown (or just below the crown on the blades if the crown is bulbous in the middle) look down along the steerer to check if these two straight edges are parallel