Easy one
Hello,
With two shrouds in the same hole, a very tight figure-8 lashing, top and bottom, will suffice. Or square lash from above to below. Remember, you are just trying to fix the position vertically, by generating friction.
As for the backstay's effect, we are into an utterly different set of considerations, having nothing directly to do with the seizings. If the spreaders move when you tighten the backstay, it is because the mast is bending. This is natural, so long as the movement is within the mast's and spreader's abilities to deform safely. Any details here?
Fair leads,
Brion Toss
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