At that age, you cannot use cervical dislocation on a pink. Cervical dislocation may only be used in adult rodents, as it can be difficult to perform in neonates and thus is not appropriate for use in animals prior to weaning. There is nothing to 'grab'. On an older rat, you can yank the tail, but pinks are already fragile and you'd probably pull the tail off.
People use CO2, but it's not really recommended for pinks due to their resistance to hypoxia. Because of this resistance, they don't need much oxygen, which allows them to endure their nursing life under mom. So it takes forever for them to be put down.
This is cruel to any other animal and older rats, but the only acceptable humane method(by IACUC) to put down pinks is to freeze them.
But like Mike, you can probably flick their heads and they'll die.
On fuzzies, you can probably just use CO2, or flicking.
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