If you want to stop the bars sliding forward, i've used a bucket on each end tied together with a rope to stop the bars sliding forward, then lash the bundle down to whatever,
If you really want to be serious about the set up, and doubt a bucket is man enough to stop being perforated, you coud use the bottom end end of an old oxy cylinder with a couple of holes drilled in to attach the rope to, or even fabricate one up,
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