Because it is iron which can be welded easily, I will use it for trial production. Because many are not necessary, it is saved with a small pack. Although it is a little expensive but 299 yen in 6 pieces, it is UNF, so it can not be helped.
The folded back part of the seat belt of the backseat of the light cargo bought second hand was tightened by the body with the ring bolt so that the rope could be hung, the fold-back part did not shake, the belt was hardened in and out So, to squeeze the nut between the body and the folded part so that the folded part can swing freely, the bolt was tightened again. I had difficulty without knowing the size of the seat belt screws.