Carefully sandwich the dies between some heavy plates. (1/2" here) I usually start in the middle, and I do not press it all the way. Just enough to 'lock' it into the dies. Progress back, and forth pressing harder all the time. Here I do it in 3 places, it all depends on the size of the piece. I have found pressing down completely the first time tends to cause more distortion in the complete piece. I have converted my 50 ton press for air over operation. makes repeated pressing a breeze.
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