What would make this work?

[SNjVaper]

I'm building a mod and I was thinking of using this : Adjustable-Voltage Regulator LM317T - RadioShack.com . But, I want to make the mod vari volt with some sort of turn or dial knob. What kind of switch can I used?

 

[Para]

What kind of switch can I used?

This one from madvapes is really good