One other thing that I find particularly bad on Dunnhill lighters is the flame regulation. When you first spark them they often stutter a little, then give a little pop before the flame settles into a steady state.
Again, a cheap disposable or Clipper is frustratingly gives a far smoother flame than a Rollagas.
I've given up using genuine Dunhill gas as it doesn't make any difference. I've tried changing the filter in them but again with little effect.
Anyone else suffering the same problems, and better still, anyone have any suggestions for fixes?