The stop motion wheel on the 431G is made of plastic and will crack over time.
I tested a stop motion wheel and washer clutch from a Singer 401a and they fit and worked perfectly. If the wheel ever breaks, I can replace it with the metal parts from a Singer 401a.
![](http://midcenturysinger.com/wp-content/uploads/2023/03/IMG_20230228_161030-683x1024.jpg)
![](http://midcenturysinger.com/wp-content/uploads/2023/03/IMG_20230228_160817-683x1024.jpg)
![](http://midcenturysinger.com/wp-content/uploads/2023/03/IMG_20230228_160651-683x1024.jpg)