Quick-Rack XL

Need some fiddling with right amount of torque on screw near seat post: too much cause squeeking sound (moving plastic on plastic) at each movement, too loose will cause rack to untie. Also, whole concept rest on two small screw tightened to horizontal strut (near top of rack). Would be nice to have a security stopper screwed at end of strut in case those small screws come loose and strut wants to slip (my rack platform slipped back on the wheel, partly because weight was too much far back and screws on strut became loose. I check them before long rides and try to center weight straight over axle (a bit of annoyance compared to other racks)