"He who marches out of step hears another drum." ~ Ken Kesey
we had 2 that sat in a closet for years at my old shop. finally i threw them in the garbage. unless you have a pre mid 90's press, they are useless.
and if I were your boss, I'd be pissed. Those things are worth putting on digitsmith. A tech will snap those up if they are in good shape, or a large shop that is in need of one for their maintenance dept.That being said, I have thrown out a ton of stuff over the years only to realize I should have held onto it.
I'm sure one reason why some manufacturers wouldn't want just any yahoo with a Z-Bar would be because in the wrong hands that tool could really do some damage. You can really screw a press up if you're not careful and don't know what you're doing.
Ill snap pictuers of my home made rig later. I also have a set of templates for one a machine shop or someone handy could fab. It is simply some alum flat bar 4" and 1" both 3/8", shoulder bolt, some bearing, set screw and 1/2" dowl pin. Nothing fancy but works just fine.