This is a photo of me playing my special one handed Dolmetsch Descant (Soprano) Gold Series Recorder, I use this quite a lot and have played in the "Children Helping Children" concert in the Cadogan Hall, Sloane Square, London, and in quite a few other concerts.
These wonderful pearwood instruments are made by Dolmetsch instrument makers for people like me who only have the use of one hand, the adaptation consists of adding key-work to cover the holes normally closed by the missing hand. In consequence, each model has its own, often complex, system of fingering. Gold is used instead of nickel plating, which helps to avoid allergies, and each instrument is fitted with with a special adjustable thumbrest. They make a left and right hander version.