This works well with electrolytic caps because modern ones are so much smaller for the same voltage and capacitance rating than older ones were. You can also h

This works well with electrolytic caps because modern ones are so much smaller for the same voltage and capacitance rating than older ones were. You can also hollow out old carbon comp resistors and put metal film resistors inside them. As a bonus you could use resistor shells on the outside with color bands that don't at all represent the actual value of the resistor inside as a practical joke on anyone trying to clone the circuit.