Elftmann Spring Engine Starter
 

Are they still available? I haven't seen them advertised in a couple of years. My portable starter won't crank my .91/1.2 FS, my flight box is getting heavier and heavier and I was thinking that one of these hanging on my belt would be a blessing rather than dragging the plane back to the flight line and restarting there. Does anyone know about them? Available? How much? Do they work? Thanks!!!