On an earlier day of using the porta power, I tried to save time by inserting a piece of 3" diameter steel roundstock in place once the cylinder had reached it's maximum extension. That would have saved setting up the chains every 5 inches. A large bang told me it was a bad choice. There was a second smaller bang when the 8 pound chunk of bar landed somewhere behind me.
I did not try that method again. Pretty sure, had it found the top of my head, I would have needed more than a few aspirin for the headache.
So in the end no blood.
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