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Adjusting very tight Graham Rigging screws

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I need to adjust some rig tension. They are Graham screws and on my first attempt they felt very very tight.I was able to loosen for-stay, so the rig tension was relaxed.

Do I just carry on with force to break the lock/binding or fill with WD40 for a couple of weeks an try again? 

Thanks for ideas.

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So it's possible that the threads are galled. If so, they need to be replaced. So;

Support the rig with a halyard. Take the rigging screws off completely, clean, inspect and if ok lubricate and ensure they are free to move by hand when unloaded. If all that is ok, re-install...

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