The Grand Concerto

We call it the Grand Concerto because all the parts come together in perfect harmony...the plug, the locking collar nut and the endpin rod. This combination delivers the maximum impact to enhance cello and bass acoustical output by increasing amplitude, volume, tonal quality or "core", responsiveness and clarity, as well as resonance from ppp to FFF.

Replacing the plug in any instrument should be done by a professional luthier.

Click here to contact Tom DeVuono for further details about pricing, ordering and customization.

Grand Conerto
Grand Concerto
Grand Concerto
Exploded view
Exploded View
Exploded View
Grand Concerto with Super Pin
Grand Concerto with Super Pin
Grand Concerto with Super Pin

Locking Collar Nuts

There are three optional collar nuts which can be used with the Grand Concerto assembly.

Shown (left to right) are the Solid Brass Model, A collar with 12 drilled holes to reduce mass, and a hybrid version with four of the 12 holes filled with a proprietary material.

Each delivers a distinctive difference in string an bow response as well as instrument projection by varying the reactive mass

Locking Collar Nuts
Locking Collar Nuts
Locking Collar Nuts


* CAUTION: To prevent injury, point the sharpened tip away from yourself or others when removing or installing the assembly.


Protected by patent #US6998523