stevenal wrote:
stevenal wrote:
Upon further thought on the subject, I believe there is a design flaw here. It's not clear in the picture, but the threads don't stop at the collar, they extend to the hidden top of the rod. The inside of the collar is cylindrical, un-threaded. The joining pin then crosses a gap from collar to shaft so that the force on the pin is a bending moment. In my experience, roll pins are used where they are subject only to shear forces such as the pin located a bit higher in the photo. I'll be inspecting my other 4500 once the camper is off the truck again.
I agree that using a roll pin in that application is not right. Roll pins are only designed for shear so it might be best to take the screws to a machine shop with a lathe and turn the shafts down to the minor diameter of the thread and then have a sleeve machined to fill the void. Match cross drilling the sleeve could be a bit tricky but the roll pins would be back in a shear situation.
