Thumbwheel Keeper for Maker Select and possibly other Prusa I3 clones

The Maker Select, and other I3 clones from what I hear, have a serious problem with the bed drifting out of level. I was going to get another set of nuts and use them as jam nuts, but came up with this instead. It grips the thumbwheel and indexes against the edge of the base plate. I haven't had to adjust my bed since I installed these 6 months ago.

The STL is a mirrored pair, print two of each. There's not much room between the thumbwheel and the bed guide mounting plate on the maker sel