I have made a couple of different versions of these and my latest set is pretty versatile and works very well. So I thought i would share the design. I start out with 1.5" square solid bars and some 1.5" angles to keep them oriented. The angle iron was thin, so I welded in some 1" rounds to support them. I have the benefit of an automated stop system to keep them from compressing too far.     Then I made a top die with 1" square solid that will index into the 1.5"
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