Very cool...and it looked like you figured it out as you went along. So, what you did essentially was to replace the diaphragm? Is that what you cut out with the scissors? Thx.
Notice you removed a small piece of adhesive foam tape and replaced it with a piece the same size as the piezo and then surrounded it all with glue? Response probably sucked when you were done as the piezo needs to "flex" in order to generate the correct output to the drum module.
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