If I were to follow your method I personally would attach the net at six
points (3 on each vertical side) on the premise that if one point chafes
through the kid(s) won't fall through the net so readily.

The sailor is correct though, from a long term perspective. His method
will last almost indefinitely. Yours, through-drilled and figure-eight
knotted, will last for a few to perhaps several years depending on the
amount of time the kids have at it, but will eventually wear through and
break in at least one place. When that occurs, you replace the whole net.

Bottom line is that it's your choice as to where you want to make the
tradeoff between cost and absolute safety.

J.


wrote:
I have a platform tree house supported by 4 4x4 pressure treated
posts. I want to build a rope cargo net between 2 of the posts. To
do so, I either need to drill about 4 holes in two of the posts, or
use eye bolts. Because of the size of the rope, I would need to drill
one inch holes in the 4x4's. Will they retain their strength if there
are 4 one inch holes drilled through them about one foot apart? Or
should I bite the bullet and buy the eye bolts?

Thanks