Grab the D-Ring tripod screw and insert it into the camera mount. The screw will be very loose and fall out easily. Hold the screw in place while installing it to the Pillow Block.
Install Camera Mount
While holding the tripod screw, place the camera mount on top of the linear bearing pillow block. Orient the mount so the mounting holes line up. M5 x 16mm long screws will secure the camera mount to the linear bearing pillow block.