(under subclass 38.1) Subject matter consisting of a slot, a lug, and projection and frictional retaining means adapted to secure a hook to the check-rein and a tree plate to the saddle tree. [figure] [caption]A-Saddle tree; B-Tree plate; C-Check hook; D-Securing pin; a, b, c-Apertures; i-Slot; i'-Lug