In addition, because it was an age when carpenters' tools such as dai-ganna (a plane) were not yet developed and only big-boned combined wooden materials in a frame were produced, it seems to have been a very unrefined and heavy fitting compared to those used today.
しかも大工道具が未発達で台鉋もない時代で、骨太い組子しか作れなかった為、今日から考えると実に武骨で大変重い建具であったと思われる。