Nice old school stuff.
Been my experience that some guy's back away from equipment that doesn't look familiar to them. Takes time to get use to, if at all, I guess.
How long are those bars? If collars always come loose, drill a hole in front of collars for a set pin to slide through. To the extreme, weld a small tack on the collars to the bar. A couple of out members were welders, and help build a lot of our basic equipment.