What you need:
. Old Timpani head
. Marker
. Cutter
. Thin sandpaper
. Water base glue
. Belt
. Bowl with water (better warm/cold, not hot)
Learned this from my friend Paolino in Parma, now I decided to share with you this super easy job to restore old tambourine (like this one from the Ruse Opera Theatre, Bulgaria).
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