The top Spruce wedges for the Guadagnini model cello. This is a very old wood, maybe thirty years or so - from several
I recently aquired. The edges are bandsawed back to follow the line of the winter growth and to removed old oxidized surface timber.
I do a rubbed joint with hide glue. The lower, 'flat' side needs olny to be true enough to allow sufficient wood for the arching height.
I decide, with spruce, which side will be the arch side according to the quarter of the winter growth - keeping the treble,
soundpost side, as the the most perfect vertical quartering if its wandering off a little as is commom with large cello wedges.