How do I use this?

jas7

Forum Newbie
Joined
Jan 15, 2016
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Hi guys,

Please have a look at the picture I have attached in this thread. As you can see in the pic, I have circled the object in yellow. How do I use this? Currently its stuck on level 4, I cant seem to move it up or down and Im not sure why. Also, what is the functionality of it.

Thanks!

$_86.JPG
 
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