Before ordering, I figured that the aluminum cam handle completed the final snug of the bolt. However, this is not the case. The cam handle is just a handle to turn the fastener - it does not snug that fastener. There are two black colored 3D printed parts that both have a metal core. The upper portion is Loctited in place relative to the cam handle threads, so it doesn't move. The bottom 3D printed part is free to move a bit. There is a lock washer and a flat washer on top of the upper 3D printed part. The lock washer gives some compliance and keeps the assembly tight. The flat washer is drilled pretty close to the diameter of threaded shaft - that must be in an effort to keep the washer and lock washer captive (not readily falling into the dirt/grass when you remove the assembly). However, since the flat washer is fairly tight on the threaded shaft, it doesn't move very easily, which negates the effect of the the lock washer. In a worst case, if the assembly un-screwed enough from the bike to be loose, it really can't spin very far because the cam handle contacts the frame of the bike. Overall, it's a better setup than the stock bolt - it just works differently than I imagined. One star off for the way the flat washer moves relative to the threads (one of my washers had a pretty big burr on it that I had to remove). Keep making stuff for the TW200, 3DUB200!