It may sound silly, but it is very hard for me to open the top of the tank catridges in order to refill tanks, especially type B. I have tried with every tool available in my warehouse but I ended up with scratches and broken nails
. Now I refill them with a syringe but I would love to have something easier than that...
Do you happen to know any kind of tool that I can use for that purpose? Have you seen anything in any web e-cig shop that might help me in opening the tanks?

Do you happen to know any kind of tool that I can use for that purpose? Have you seen anything in any web e-cig shop that might help me in opening the tanks?