This is the single center part of finishing FL71-BINO.A pair of dovetails that holds each OTAs perpendicular to themselves will be held by this part, dovetail holder. A pair of dovetail plates will be opend and shut just like the both side sliding doors. A wise device will be introduced to the dovetail plates pair to move symmetrically.

アリガタ、アリミゾ方式が小規模なBINOの眼幅調整に有効なことは、Finder-BINOですでに実証済みです。FL71-BINOでは、アリミゾプレート面を鏡筒と垂直に用います。　鏡筒が垂直に取り付く2枚のアリガタプレートが連動して対称的に開閉します。　シンプルな連動機構も設計済みです。