Brian same question here. I have talked to many young office type Hilti reps.who say, no puncturing needed at the nozzle end. I have watched 10 videos on this tool. 2 of them show an operator pulling out a plastic 'wad/plug' with a nail then puncturing the foil twice (like traditional cartridges). I am afraid of an internal implosion under pressure if no hole is made but supposed to. Owners manuals do not show any puncturing or unplugging. Just insert, and start squeezing. Did you find out anything? Matt Goddard-Owner Poetry In Stone

Would like to know as well

​@@DeinemudderHauke I just used this platform for a sculpture project. After much research and asking of Hilti Reps, I felt assured that 'no puncturing' anywhere on the 'cartridges/sausages' is necessary. This video, (and others) are vague on details. First you insert cartridge with nozzle screwed on, squeeze til you hear a pop(3-6 trigger pulls) this means the 'cartridge/sausage' is punctured internally, then 3-6 more trigger pulls will show the ingredients mixing in the nozzle. Let the first 3 dabs of partially mixed epoxy be waste material on some cardboard/plastic, then as he says you are ready to 'Rock and Roll' Our 2 operators used up 7 (11oz) cartridges in 15 minutes. We worked fast since it was hot day. The success of our expensive project hinged on the performance of this Hilti product and platform. I am pleased with the result, but surprised that it took over 5 hours of online and real world research to determine whether the cartridges/sausages needed 'pre puncturing'. Some language barriers amongst video creators added further muddiness to the use protocols. After using once, you will be a pro. The standard / basic metal caulking guns would not have extruded the amount of product in the 'working time' window that we had. If this operation was a regular scenario, I might even jump up to the battery powered model, but the manual option was smooth and hassle free. Good luck. Matt Goddard-Owner Poetry In Stone www.poetryinstone.com Oregon