I spent the night before Thanksgiving drilling holes in our deck posts. The cable rails will be 1/8", so the holes are 1/4". And we will have double posts on the corners with spacers in between; I overdrilled the holes on the spacers (1/4") so that passing the cables through three sets of holes won't be impossible.
Stained and ready to go:
Assembling the double posts:
Sarah's brother Greg on the business end of the ladder (he was in charge of bolting the posts to the deck):
The finished product: