if your refering to how the heat sinks only have 2 holes to attach to the frame rail, and then the heat sinks can rotate on those screws like a pivot point, then yes, i know exactly what your talking about, also it looks like the rapid led frame is flat stock?,, i see 2 options, if your going to use what you have, you could drill a hole in the frame to the left or right of the heat sink set screw and put in another screw that wedeges against the heat sink forcing it to stop by wedge or friction, or option 2 like me use aluminum angle from home depot and set the angle so the heat sink sits on one side and cant pivot, , but hey go with easy, and get some jam screws going,,, i hope i am not talking out of my &@)@&# hahaha, pretty stoned