Looks like Bender Hot Rods. Based on your pic (sled being upside down), they work like 03viperguy noted. When you turn the sled right side up , you would slide the blue collar down and turn a full 360deg. There should be a pin in the collar that positively locates in a hole in the washer plate welded to the rod. Before you do any of that though, you may want to reinstall that Allen screw exactly how it was and hope it wasn't holding anything in position that has since moved. I recall a warning in the instructions about not moving or removing that screw, so I always assumed that it located something or held something in place that was very important.
I have the same ones but there is a grease fitting on it. I wonder if someone put it in thinking thats what is supposed to be there. Mine has no allen screw. Now after looking at pics, they are different.
Okay I got them figured out. One last question do I need to snug up the Allen screw every time or can I leave it loose enough where I can pull back the collar?
That screw is supposed to be left in place, no reason to touch it. Locktite it in place and make sure that you can still slide and turn the collar to make adjustments thru the full range.
related. not getting enough transfer. front shock set at 80mm, soft. rear at 90 mm. soft. still not getting enough ski lift. straps are all the way out, ideas?
by the way, the set screw needs blue locktite, and should never be moved. it is a locator for each click. mine were loose from bender, and should be snug, then back off 1/4 turn so they don't drag.