Fly Away Rail Guides (38mm, 54mm, 2.6in, 76mm, and 98mm available)

Why are Fly Away Rail Guides better than normal rail buttons?  Generally two reasons:  1) You don't have drill unnecessary holes in your rockets for rail buttons. 2) Reduced drag, for the fastest and highest flights possible. Launch towers work well too, but they are a pain in the butt to carry around or make sure there is one at the range which fits your rocket.  How does it work?  The guide is made from two halves, which clamp around your rocket. The pairs of rail buttons hold the guide together when the rocket is on the rail, and as the rocket leaves the rail, the two halves spring open.  To keep friction to a minimum, the springs are attached so the force is very small when the guides are closed, but much stronger once it begins to open. The guide detaches from the rocket almost immediately once it has left the rail.  How is this different from other fly away guides? All of my guides use aluminum tubing for pivots as well as steel springs for the opening mechanism. Additionally, th