Removing snapped delivery tubes from bungs

I got one of these instead, they seem happy enough using chip rather than cylinders.
My line manager asked me to purchase one if these back in September so we've been using it instead this school year. Kind of miss the ole core borers though, probably because they are easier to use even if they take longer.
Got one, shockingly good. Has a removable rubber end to help push through the bung, which you then remove and feed the glass rod into the metal tub (like a core borer) then remove.

Because of the rubber tip a lot easier to push through the bung then using a core borer.
Never seen these before but just got our finance dept to order one for me. Thanks :D