Review on Wangdd22 Backlash Spring Elimination Threaded by Moises Dzihic

I bought a pair of these along with a pair of 400mm threaded rods to replace the slightly wobbly ones that came with my Anet A8. To be honest I don't really understand what they are doing. Based on their design and the way I attached them to the carriages and bars, I'm guessing that they apply pressure and push the carriage up or down slightly (down in my case because I figured gravity would do the rest) and stop the cars. from the Z offset. If that's what they're supposed to do, then I think they work as intended! Hooray! 4 stars because I'm not sure what they do.