Hi,
I would only recommend assist feeding for snakes that have never eaten by themselves previously - new hatchlings mainly.
They can go quite a while fasting without losing much weight or condition - one of my males does it every winter.
Did you change anything husbandry related just before he went off feed?
But I suspect the size of the prey may be an issue - a pinkie rat is a bit small and you may get a better response with something a bit larger.
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