Bike Frame Quick release design

I do not know about other users of this bike but I find that the rear quick release assembly to be not as well designed as it could be. My will come off the bottom section of the frame when the bike is unfolded. The main problem I see is the fact that the quick release bolt holds the section on place. That is the only fastner on the assembly. If the bolt that holds the assembly becomes loose, this when the part comes out. The problem with this is that the nylon bushings are in the bottom tube come out when the top tube is pulled.

I looked at a tripod design I has. It is a Manfrotto art 190 model. The design of the legs locks is a very good one. It uses a double fastner system that locks the mounting assembly on to the tripod leg. The locking fastner that locks up leg sections are separate from primary fastner that locks the assembly into place. I could see something like this being used on the A-bike design to improve locking quick release assembly. The single fastner design used now to me does not really cut it. This tripod inspired design looks far better. I think that this bike design is basicly sound and small details like this only inprove the bike.