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I've seen this a few times. I think it is from the jam nuts being over-tightened and stretching the screw. You can remove the screw backwards, which will pop off the cap as it hits the rocker. You can then run a die over the screw and pop the cap back on. I'm sure the purists will tell you to buy new adjuster screws, but the only part that might be compromised is the tip that the jam nut is on. It may be difficult to start the die on the end with the slotted head, especially if the head has been deformed by many valve adjustments.
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