The picture you attached is the lock ring. The sprocket is the round
bit with the teeth for the chain. The sprocket threads onto the hub and
then the lock ring threads on. The lock ring holds the sprocket from
slipping and coming unthreaded. As long as both the sprocket and lock
ring don't slip then the sprocket stays tight.
The lock ring requires a special wrench to tighten. A bike shop will
have the necessary tool to tighten the lock ring.
It is very very important that the sprocket and lock ring be properly
tightened. If the sprocket slips you will fall off the giraffe. The
fall can be very fast and without control. Very dangerous.
Take it to a bike shop and have them put the sprocket and lock ring on
using permanent high strength Loctite threadlocker. The threads should
first be cleaned with Loctite primer to make sure you get the strongest
possible bond. Be sure to impress upon the bike mechanic that it is
very very dangerous for you if the sprocket slips and that the high
strength Loctite really really is necessary. Print this bit out and
make sure the bike mechanic understands.
There is a basic assembly manual at the Torker USA web site: 'Torker USA
assembly manual' (http://www.torkerusa.com/unicyclemanual.pdf) (PDF
file)
At the bottom of the second page are the basic instructions for
assembling a giraffe. But they don't say anything about how to tighten
the sprocket and lock ring.
--
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