Welcome to the "design spiral," where the size and location of everything is predicated by the size and location of everything else. Whenever possible I buy a small sample of everything I'm thinking of using (one block, one turnbuckle, one shackle, ten feet of shroud material) and see if it all fits. For my leather-eyed shrouds I'll just buy the biggest thimble that will squeeze between the turnbuckle jaws and hope the leathering fits. Crude, I know, but sufficient for those of us who are mathematically challenged.
Good luck!
Ben
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