These are backplate roller adjustments. It is similar to the Pterodactyl system except you can interchange them with different backplates. Can't wait to set it up...
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Do you pronounce the P ?
I guess it's an answer to this
http://photos1.blogger.com/x/blogger/6877/3327/1600/854755/pterodactyl_ad_2006b.png
For whatever that's worth.
The cost is that, if your waist buckle comes undone, your whole rig is then completely unstable.