Two holes into the saddle slot? Sometimes its good to drill a bit of slot extension on the far end from where the pickup is threaded through, but I don't know why there would be two holes going through the bridge to the saddle slot. I've found only one hole with the three Sonicore systems which I've removed.
By the way, the K&K Pure Mini employs piezo crystals and could also be classified as a piezo pickup. I don't know why the term "piezo" has become synonimus with undersaddle pickups.
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