Be prepared to saw the old droplinks off.
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I found the best way to do it
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(and I know this might sound a bit extreme) was to saw diagonally through the nuts.
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Half the nut will fall away and the remaining part will almost certainly be loose enough to undo with a ring spanner.
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Other thing to consider is that you can't fit the drop-links without loosening the bolts securing the hubs to the struts.
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I found the best way to do it, with least hassle, was to remove one blot from the strut, loosen the other one.
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That'll allow you to hinge the hub and strut outward far enough to get the drop-link in behind the strut.
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