Need larger diameter bolts for better thread engagement so they don't pull out under load, you don't want bolts being pulled out when someone falls or leans on a cable, through your deck, roof, thump! etc. I use the best deep thread building/deck screws (not drywall), cheap insurance. These holes accept #8 or #9 deck screws. Locknuts (at least one) are essential to prevent turnbuckles from loosening over time and vibration, or for your children to play with. So if you have two, maintenance over the life of the installation now and then is minimal. may need to be adjusted as the cable stretches/relaxes after installation.
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