On the front of the SK450 Dead Cat bottom plate, there is a kind of shelf that holds a camera for aerial photography, videography, or FPV (or it can hold a camera gimbal). This shelf is a bit of a cantilever though, so to make sure it does not flex too much under the weight of an attached camera, and also to prevent the shelf from bouncing and messing up your video. We will now add two struts to provide support for the shelf.
The struts themselves come in three parts: a metal rod threaded at both ends, and two universal joint pieces. To assemble the struts, screw a universal joint piece onto each end of each threaded rod. Adjust the universal joint pieces so that they are parallel.
The two struts mount onto the SK450 frame with two ball-joints each. We will attach the struts first to the SK450 top plate, and then to the camera shelf on the bottom plate. First, pick up one the struts you assembled and one of the ball-joints. Put the threaded end of the ball-joint through the universal joint on one end of the strut. Then, put the threaded end of the ball-joint up through one of the holes in the top body plate. Finally, place a dot of thread lock onto the ball-joint screw and screw a nut onto the ball-joint to hold it in place. If you are a bit confused at this point, take a look at the images on this step for clarification; this step is not as complex as it sounds. Repeat this process with the other strut.
At this point you should have the two struts attached to the SK450 top body plate. Now we will attach the other ends of the struts to the camera shelf. First though, you will need to adjust the length of the struts by screwing down or loosening the universal joints. You want the struts to be fairly tight so that the camera shelf can only bend a tiny bit before running out of slack and being held in place nicely by the struts.
Like before, insert the threaded end of the ball-joint through the universal joint on the strut, and down through the hole in the camera shelf. Then, deposit a bit of thread lock onto the ball-joint threads and screw on a nut. Repeat with the other strut and you are finally done with this step.