Original style belt for your Singer Featherweight.
A few years ago the only belts available were an orange belt with cogs on the underside. When you see these on a Featherweight they simply scream at you. However, they did keep the machines sewing - and that is the most important thing.
Now these V-type belts are available. These are the original style that Singer designed for the Model 221 machines. They are black and look 'just right' as well as function correctly.
Motor belts should be changed when they are cracked or the surface is slick like a "bald tire".
Video demonstration for how to correctly and safely change the belt on a Singer Featherweight in the May 2017 Tip of the Month.