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Yes, if you're careful not to crack the ceramic or distort the disk you can drill piezos without any problems. It would be easier with a drill press than using a handheld drill as shown. The aim should be to maximise the area of the ceramic. I suspect that a large disk with a hole will yield more ceramic, and thus more piezo electric force than two or more small disks. Looking at the disassembley video, there is also an area that would have to be cut away from the disk for the charging pins to pass through.
stewartg
Well first I thought this is a joke, drilling a hole into a piezzo and than I found this video https://youtu.be/59AWAWpSCk8
I definitely have to try this. Thanks for sharing this idea!