I want to give a shout out and recommend a relatively new workshop in Germany. Alex Schölkopf used to make sackbuts at Egger in Switzerland where he did terrific work, and has since a few years established his own workshop in Magdeburg where he makes new instruments (both historical and modern), makes custom mods and builds, as well as repair work. Really beautiful stuff.
Oh! Didn't know about that shop. Thanks for the info!
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Like trombones? Head over to https://swisstbone.com/ to see some great vintage and custom horns!