Brass Crank for Japanese Wooden Sumitsubo

Weight:  about 14g

Threaded shaft length: 40mm (with a 15mm threaded portion)

Threaded shaft diameter: 4mm

Accessories：—

Additional Information:  New Old Stock (NOS) in good condition, and expertly crafted. I discovered them tucked away in the corner of a historic shop in Tokyo, where they have been preserved for over a decade.