Strapped down like a long unclean gown on a washboard;
head bent backwards with a hollow ball to gag the mouth.
The restrained will flop around like a live fish about to be filleted,
as the first several gallons are poured directly over the chin.
...
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I think you could end the poem after the word 'begins' You don't need to repeat the title-it's already made its impact. I like the first line especially-concise original image.