Aligning of banknotes is carried out without using an aligning device. The fluid warming chamber has a fluid inlet that communicates with a fluid pathway. Each pulsejet 3100 repeatedly ignites the energetic fluid 7 causing a plurality of rapidly-expanding gas bubbles 3250 which create and force a plurality liquid slugs 10 ahead of them rapidly out through a nozzle 3260 causing the slugs 10 to impact against materials ahead of the nozzles 3260, boring an access hole 5.