The center head has a ball
bearing plate at the bottom to allow the pad to rotate 360 degrees around
the rail axis. (Much like a lazy Susan style turntable.)
is set by turning a double ended screw mechanism much like on the popular
A large T-handled pull-pin
can be removed to tilt the rail down to load rockets.
The pad has a built-in
circular blast plate but it works better to bolt an angled blast plate to
the rail that also serves as a standoff for the rocket to rest against
prior to launch.