Dru Blair's The Original SoftSpringDru Blair's The Original SoftSpring: The Softest Air Valve Spring Available! Simply the best modification you can make to your GSI Creos or Iwata airbrush. Why upgrade your air valve spring? Stock air valve springs have too much tension. Replacing the original spring with a new BLAIR SoftSpring will make it much easier to control, as well as reduce finger fatigue. BLAIR is the original SoftSpring manufacturer, and the only source that replicates the