Next fit the IC socket, the battery holders (B1 and B2), the switch (S1). The speaker SP1 can now be fitted and it does not matter which way around it is fitted in this circuit. Finally fit the jack socket (X1). You have now finished the soldering aspect of the project. To finish up, fit the four plastic feet by pushing them into the holes from the underside of the board. Attach the potentiometer knob by inserting it from the top. Lastly, insert the IC taking care to ensure that the indent or dimple indicating pin 1 is in a NW orientation.