Re: Set-up for pulling a tube
The eyes are welded to the tube and they are normally great big thick castings or extrusions BUT, they are welded to the tube which is only .080 and they really don't like side loads, if you bend them enough the welds will crack and you have a leaking tube.
A better plan is to use some stainless U bolts at the deck corners right above the brackets, strongest part of the boat, and a harness, it is a rope that attaches to both eyes and has a pully that slides back and forth on the rope.
You are dealing with ahuge amount of force here so be sure you go through the crossmember and right above the brackets and I would put the U bolt in at an angle with the bottom narrower so you are putting more of a straight line pull on them rather than a side load.
iboats has the bolts but not the harness, maybe someone else will chime in where to get those but I would imagine any ski shop or marina would have them, here are the bolts you want.
http://www.iboats.com/EYE-U-BOLT-Attwood/dm/*******.854177004--session_id.132321232--view_id.931943