Joe Danielek wrote: “It may seem the riser is pushing but it’s the downstream cooling effect that is pulling (“contraction”) the flame to behave the way it does in the J-tube. ”
Yury Smirnov wrote:
The same flat-cutter can be used by left-handed and right-handed person. It works well from both sides.
Important thing is that it is designed to work with both hands - to make it work in the most effective way.
Of course you can use only one hand to work with flat-cutter, but it takes time to get used to work with one hand.