setscrews walking so pin the fitting
Buying a pricey frame from the big box raft frame retailer will not get you a quality frame. Setscrew fittings will work just fine when accompanied by a quick release pin. Yokes are better when welded; struts are a good work-around. Use good alloy 6061-T6 in lieu of the 6063 T6, T4 and T0 for a 40%, 100% and 350% increase in strength respectively.
Many of the fabricators use 6063 because it strains plastic without grain separation. This make nice bends and swage joints which are pretty but dysfunctional. This characteristic of being plastic causes the pipe to strain under the force of the setscrew. The 6063 pipe deforms and the setscrews loosen. Tightening the setscrew additionally in the plastic range only make the problem worse. Properly constructed, a setscrew tee w/pin will accommodate 500# of thrust in any direction. Said setscrew tee will outperform a ubolt tee 3:1 and the older version circa 1990 1.5:1
Proclaimed Lobbyist for Whitewater