BB,
What is the foam buffer (as required) for? Is it to seal the end cap with the eye hook so water doesn't get in the PVC pipe? Or is it to deaden the sound of the rebar hitting the end cap? Or to protect the end cap from the rebar hit?
With the rebar inside the pipe, I am guessing it would fill with water making it heavier. I think maybe all three are good reasons for using the foam buffer.
Peke