I think the Robertson extensions are elegant and beautiful. But I have two questions: 1)Why do they screw the extension on (in two places)? This makes it difficult to change strings and near-impossible to dress the fingerboard. 2)Why do they cut fancy filigree into the back of the extension? Sometimes a player needs to quickly get his thumb behind the extension to hold a long note manually, and the dips and points back there make it dangerous.
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