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@gbj_tester
Forks are usually quite easy, the brake bridge presents 2 problems; you need to access it from inside the rear triangle, and many old lower end frames have simple tube bridges so you also have to modify the convex washer[left]. You might try using a nut on the "front" calliper at the back, and a long Allen key tube nut[right] on the "rear" calliper at the front.
In theory, you're also supposed to make a counterbore or at least a spot face 10mm diameter to seat the flange of the tube nut. If the fork crown has a flat face, you needn't bother with this, but it would look much tidier in the case of a unicrown type fork.
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