I guess that's 1970's engineering, but seems like a crappy way to assemble a component that carries fuel. I'll try and disassemble mine this week and see what I can find. I'll figure out how to fix the vacuum petcock, but I'm still leaning towards replacing them with those non-vacuum petcocks. I don't like the idea of trusting a rubber flap to hold fuel in the tank as opposed to having the ability to turn it off when not in use. New Coke seemed like a great idea at the time too, but didn't work out so well.Just glued and prevented from turning (much) by a couple of pins. there are several designs some years have two different type petcocks left to rightView attachment 134560