It became clear lens and it became easy to see! I think there are individual differences. The electrode rod was not fixed if the collet and the torch cap were not firm when attaching the 1.6 mm electrode rod. It becomes a glass nozzle and I am taking care of removing it. After that, to change the diameter of the electrode rod, I would like to see that a tungsten adapter suitable for that diameter is needed. Since only 10 sets of tungsten adapters are sold, it will be helpful if you can sell them in bulk or 5 sets.