The forks on my 39 are the girders with limiting springs. I'm in the process of putting the forks back together after checking, cleaning, etc.The check springs are adjustable in length, and I have found no info anywhere on how to set them up. Everything seems to be in good shape, and the forks move freely up and down, just want to do things right the first time.
Bill
Mine are just snug so they…
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Springs
Thinking along those lines. These were a job to get off because they were under a lot of tension. One thing I found was that the bearing race in the upper mount was loose, and had moved around to where the little hole that is above the grease fitting wasn't where it is supposed to be, blocking the balls from any fresh grease. I enlarged the hole a bit and locked it into place with bearing retainer.
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Mine are just snug so they don't rattle when as slack as they can be. Their tension increases by the same amount for every step rise in height of the fork, so (as far as I can work out) the actual starting tension is not important. But they shouldn't rattle about. (And it's not easy to assemble them at a high tension.