Perry Ritter’s tiny saxophone repair shop in Midtown Manhattan is as much a visual flight of fancy as a jazz solo is an auditory one.

The shop — in the heart of the Diamond District, on West 47th Street — is crowded with used instruments and the whimsical sculptures that Mr. Ritter creates during his downtime from spare saxophone parts.

Mr. Ritter, 59, has been repairing saxophones in Midtown for more than 40 years and is the go-to technician for some of the biggest jazz players in New York.

His workbench is nestled in one of the densest commercial hives in the city, in a building largely occupied by jewelry merchants.