I have driven the steel M6, but it was necessary to drive nearly 100, but the mandrel is often spoiled with 2 or 3 pieces and the nut or nutter which has stuck is cut with a grinder etc. Working, due to this troubleshooting, not only about 30 out of 100 became losses, but also the construction scheduled to be completed in half a day took 3.5 days. It's the worst. We will make design changes to specifications that do not use Ebinaut next time. Can I go if I dedicated electric nutter or air? However, the exclusive aircraft is too expensive.