Catrike 2007 Trail Owner's Manual page 21

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Remove the screws from the seat bar clamps to mount the clamps on the top horizontal seat bar. Center the space neck rest and barely
snug up the clamp bolts. You'll likely be moving this clamp as you adjust the neck rest.
You can now adjust the space neck rest height and angle to fit you.
Loosen the bottom adjusting bolts to slide the side plates up and down to adjust height.
Loosen the top adjusting bolts to adjust the angle of the top of the space neck rest.
Once you have the neck rest where you want it rotate the clamps on the horizontal seat bar until the neck rest stop is in contact with the
side plate.
Tighten all the bolts and you are ready to ride in style!
owner's manual - page 21