Instead of the usual wheel devices, i wanted something with spokes because it gives me the ability to better fine-tune height by just pushing the spoke clockwise or counterclockwise. Also the design features maximum resistance against the other surface so it doesn't move while your printer is doing al this staccato moves while printing.dimensions for the nut are tight (and of course depend on the resolution of your 3d-printer). For me it works best to press the nut in directly after printing when the PLA is still warm. To do this i mount the nut on the bolt and user that as a stick. This way the nut stays in even when holding this thing upside down. If you are to late and still find that the nut doesn't fit easy, you can heat up the nut with a soldering iron (mounted on a bolt and keeping it with pliers of course ;) and then press it in.