Along the same lines, i use a syringe filled with vasoline. Just warm it up and then draw it up in the syringe ( i put it in one of those Glade candle holders and warmed from the outside with my heat gun). Once it become gelatinous again, you have very precise control over the amount you use. Put a small amount right on the hinge, then hit it with your heat gun and it'll flow into it. Works great, and it's a neat/clean way to keep vasoline for hobby use.