Lubrication for your central screw.
Like all gears, your central screw will require regular lubrication for smooth and bind free transition.
I normally lubricate my screw after every 20 flights.
Your options are to use white grease or in my case I use Dry fluid gear grease and Tri Flow synthetic grease.
Simply place your i1 into travel mode.
Turn it upside down and apply gear grease as required.
After 600 flights, my screw is smoother than two blocks of butter.
Enjoy and have fun greasing.