FOX Air Shox by hoser..

I use the FOX Air Shox on my Pilot, they are not air shocks they actually are charged
with nitrogen, they do not use springs like normal shocks do they rely on the oil level 
inside the reservoirs and the pressure of the nitrogen acts as a spring, the oil level 
will determine the amount of compression ratio inside the reservoir, the higher the 
oil level the higher the compression ratio.

Changing the oil level is pretty straight forward but some what time consuming and 
can be messy, you need to remove pressure from the reservoir then remove the valve 
stem and using a syringe add or remove oil then charge the shock again to the proper 
pressure to obtain the proper spring rates.

My idea was to make the end cap of the reservoirs adjustable so you can move the 
end cap which is really just a piston held into place by a snap ring at the end of the 
reservoir the nitrogen pressure pushes the piston up against the snap ring, as I 
mentioned before part of adjusting and tuning the shock is raising or lowering the 
oil level this changes the compression ratio inside the the shock I think you could 
move the end cap in and out mechanically by attaching a device that would screw 
in and out but still allow access to the valve stem so you could still add or remove 
nitrogen if needed.

To start off I need to fabricate a spacer that will go between the stock end cap and 
the snap ring.

More here I made the adjusters!