Hey! Thanks for the help last time! I want to know the PSI (Pounds Per Square inch) necessary for a disc or a cartridge to break and what would be a safe way to conduct an experiment to do it. I am not looking to get a specialized machine to do the job at all. I think it could be done with common household items but the question still eludes me because how would you measure the accuracy in a more exact fashion? The best way I think it can be accomplished is with books (which can be weighed) with the object underneath but around breaking point what could be used to get a more accurate calculation.