M3 Nut bed leveling thumb wheel

Designed specifically for the bed leveling screws on the Wanhao i3. A common mod is to add some M3 nuts to the bed for more stability. My package had extra nylock nuts so I replaced the wing nuts with nylock M3's and these thumb screws. A massive improvement when leveling.

Specifically designed for these nuts: http://www.amazon.com/gp/product/B001BHLSTI?psc=1&redirect=true&ref_=oh_aui_detailpage_o04_s00

EDIT: doubled number of teeth, generally cleaned up model

EDIT 2: Made nut 1mm smaller in diameter per feedback in comments section.