that would work
You could also just leave the rebar in the mix, the ridges would make a perfect roughened surface to grab onto as your corneas are gently annointed with various nonlethal salves and balms.
Attached to the rebar grip handles you could also have momentary switches wired to a couple hundred pounds of TNT cast into the concrete in each barrel, but you'd seriously be pushing the "nutbar" limit then.
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