Originally Posted by GeoRon
Is it basically an NRS tower that you are looking for? Of course not available in 1.5". Or it it something else?
I mean, that is the closest thing. It still isn't ideal with just the u-bolt, but seems more reliable from my experience.
Guy's fittings from whitewater machine works are better, but also don't work on 1.25 or 1.5 pipe. Rather than a u-bolt, the whole fitting has tensioned surface contact, and only one bolt to adjust. He also uses 2 fittings per oar tower, similar to the DRE rainbow approach.