id like to find a boat top fitting that's like a jaw slide but with a single tab like a eye end that will fit into a jawside. I don't know if such a item exists.
Like this clevis slide? I don't know if they're available without the top cap. Maybe Trivantage?
http://www.go2marine.com/product/113185F/sea-dog-clevis-slide-top-cap-unit-cast-316-stainless.html
These are used for lifeline attachment. Maybe this would work for you?
http://www.sailrite.com/Stanchion-Sleeve-with-Eye-for-1-OD-Tube-Stainless-Steel
June
junr that seadog is it only need to find 7/8" now