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Extensions of "short model" bass clarinets to low C are available for any make of instrument, with tuning and key action equal or superior to factory installations.

For best results the extension is permanent, though for customers who wish to preserve their instruments as unaltered as possible, it can be made "semi permanent", i.e., removable if necessary but with one-piece keys across the join.   A removable joint, with bridge keys, can be made but is discouraged due to the complexity of the extra keywork (note that once the player is accustomed to the extended bass clarinet, and a once a suitable case has been obtained, there is rarely if ever any reason to return to the short model).

Normal keywork is three thumb keys for low D, C# and C, with the touchpieces shaped to allow easy transitions between notes.  An auxiliary low D lever for the left hand little finger is a popular option.  Depending on the existing keywork, it may also be practical to add a right hand little finger key (on the upper rank, beside F/C) which is convertible to produce either D or C#.

A tuning key for low E/middle B is also offered, allowing both notes to be played exactly in tune.

(Please note that the extension is not a stand-alone product that can simply be purchased and added by the customer; it is necessary to have the complete instrument in order to fit the extension, to install the keys on the existing lower joint, and to adjust the tuning.)