Printer Bed Level Adjuster Nut Keeper for Geeetech Prusa I3

Update 11/30/18 When assembling a new printer for a friend, I found the keepers with the embedded nut had a cavity that was undersized. I replaced them with new models that are easer to embed a nut and require no support.

Update 10/9/17 , 12/3/16 See below.
The bed leveling adjustment screws on my Prusa I3 printer use a cap screw, spring and a wingnut. In order to adjust the screw, you have hold one part while turning the other. This part and a 3 mm hex nut replaces the wingnut and all