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I custom fit ebony to the scroll and use side mounted levers, reducing the width of the extension.
I make the levers from acetal and use black powder coated aluminium brackets. The "brake shoe" is made from neoprene, high density rubber for a firm buzz free fit.
Using a double wheel/pulley I can eliminate the need to drill into the scroll.
The string runs along a channel on the underside of the extension and over the second wheel, the string tension holds the extension in place.