I stole this from the VetSurgeon site, cos i thought it was useful to know, apologise to the person i stole it from
You know those small metal circles at the centre of the tops of bottles of injectables? Those ones that are attached by just two connections? And that you stick your fingernail under to try and twist off when you start the bottle?
Push them inwards with the tip of something hard - syringe nub, end of a forceps, and they pop off.
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I just use my scissors to flip it off. Quick and easy.
gonna try this now as i have a new bottle that i just nearly removed my thumbnail on!. thanx