There is almost no difference between the Simington 450 and the original Silvey swing arm. They even had the same Dayton motor.
The main difference was how the knob was made that held the chain holder on.
Simington 450
Silvey early style swing arm that belongs to me.
The main difference was how the knob was made that held the chain holder on.
Simington 450
Silvey early style swing arm that belongs to me.