The best description I've heard yet for these esoteric artifacts came from Demios, and she takes this particular item with a huge degree of seriousness. Early in her life they were, in part, the key to her salvation.
"No, Tanis, not the trash cans...the Holder of Things. I'm told the garbage is placed in the grey plastic buckets and nobody would eat out of those - blech, nasty. The Holder of Things is shiny and clean and made out of metal. They hold the most wonderful things like Frisbees and candy and beef. No one would put those things in the trash."
The Projector Station is a ground based weapon that fires extremely over sized arrows or Bolts. Massive in size, they can be turned in a complete circle, and fired with some degree of rapidity. The Bolts they fire are the size of tree limbs, and are effective to several thousand feet. Their Bolts can penetrate dragon scales, and are lethal to most life forms.
The saddles that most of the Riders use have twin straps that circle underneath the dragons at the chest level and run parallel until they meet on the opposite side. Tanis saw how they bunch up and have to be adjusted periodically. The design he had the artisans make, crisscrosses underneath and has a leather bracket that binds the two at the bottom. Further, at the top of the saddle there are two pegs on either side that act as kind of a two handed pommel configuration. During sharp turns and banking maneuvers it is difficult to keep your hands from slipping, as the pegs are just too small and are located in a non-ergonomic position in relation to the rider's posture. On his there is a curved bar that starts from the left side at the front of the saddle and arches up and over to the right. It's easier to find with either hand and in any posture during flight. The last innovation to the saddle was foot rests. Steep banks and barrel rolls can throw you right out of the saddle. It isn't the fall that kills you; it's the sudden stop at the end. There in the mountain that's not considered a joke, and if you're not careful it can become a reality. So, no stirrups for Tanis. He designed foot rests with spring loaded bars at the front and rear of the foot, that allows you to actually clip your boot onto a metal plate. Now between the arched bar/pommel and the boot clips, falling out shouldn't be a problem.