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@Ernest
Right, another ressurection on a tired subject, and one likely to outline me as a moron, but...
Im putting a beater together, falcon black diamond frame (lulz) and the headset I've got is made up of different bits, the cups fit the frame nicely, but when I try and thread on the top race, it goes on a few cm really easily, then suddenly wont budge... inspection showed a slight squashing of threads at one point, so I filed them out (with an old engineer neighbour) but to no use... tried forcing the threads past the burr, but it seems to be squashing the threads on the steerer past that point... almost as if the race size was wrong, but only aster a couple of cm...
is this me needing a 1 1/8 headset? I dont know the date of the frame, presume its 70s/80s, which would imply 1" steerer, so im confused. are there any sizes below 1" that the upper race could be, that I've unwittingly picked up?
help?