This section is from the book "The Boy Mechanic Vol. 2 1000 Things for Boys to Do", by Popular Mechanics Co.. Also available from Amazon: The Boy Mechanic, Vol2: 1000 Things for Boys to Do.
The flywheel on a sewing machine is usually turned with a semicircular face and this makes a good base on which to apply a piece of chamois skin for use in buffing nails. A strip of the chamois is cut the length of the wheel's circumference and small holes pierced in its edges, through which strings are run to hold it to the rim of the wheel. The chamois can then be removed or left on the wheel as desired. Run the machine and hold the nail on the buffer. When there is a free wheel on the machine this makes an excellent buffing device.
Ill: A Strip of Chamois Skin Attached to the Flywheel of a Sewing Machine for a Buffer