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To protect the rest of the bridge, I put a small clamp over the slot ends.
Measure/sand/measure.
We now have a depth of 5.04mm, this still leaves us with a good 2.5mm underneath.
Re-attach the piezo
The saddle sits way neater in the groove, and less chance of it snapping the bridge.
String it back up and tune.
Job done.
4.28mm
The ribbon is 0.96mm thick
In a figure 8 motion, we flat sand the bottom of the slot.
The saddle slot depth