The ruby tip is very thin, I used a jewelers saw blade and cut
around the end until the tip came off, then I filed the end smooth
very carefully to remove as little metal as possible, just making the
angle correct for the shape of the flame, and use a burr to clean the
inside of the hole after sawing and filing. The tips are about $12
each, and a #5, 6, and 7 are worth the investment if you ruin the
ruby tips. When you do this, when you light the tip, it starts out
quite a bit larger and it hisses, more when not adjusted right.