Foot Controller, Electronic, Singer 301 & 400 Series
It seems that vintage Singer machine enthusiasts either love or hate their original "button" type foot controller. Besides being awkward and uncomfortable to use, the carbon disk resistance system inside them which provides the speed control by design gets hot with use, and is prone to breakage and mis-adjustment. When plugged in there is always power going to to the foot controller since there is no off switch (except for just the light) on the vintage Singers. This can make for a dangerous situation.
This modern replacement foot controller is much more comfortable and offers better speed control than the Singer button type controller. The modern solid-state design offers better ergonomics, lighter weight, better speed control, and is safer.
The 2-prong connector fits the lower 2-prong socket on the Singer 301, 401, 403, and 404.