Yobi-tsugi,
Filling in a missing piece

This method avoids using a lot of gold but looks nice.
 

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Using tile cutters nibble the replacement piece to fit the hole.










Insert and fill the gaps with putty
Carry on with repair as normal.

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An opaque glass piece could be used so light can come through






Photo bottom left:
Then finish with metal powder. This one is 24kt gold leaf powder finish.

photo below:
For this repair I used black urushi but no powder.