1963 Dodge wipers

I have the original arms and just picked up a set of early style Anco blades. Is there a small screw that keeps the blade assembly from coming off the arm?

No, there were aftermarket arms and blades with a screw,original had the arm snap into the balde.

I can't see or find any type of spring loaded "pin" that would snap into the holes so I guess I wil have to find some very small screws. Thanks for the response...