"Hadley" Nut 'Adapter' for metric m4

i am sure there are m4 nuts that are larger on the outer dimensions but the ones i had were spinning freely in the parts where there are nuts to be inserted mid print (spider & knobs). this is a part that fits nicely in the space and the nut can be pressed into the adapter with some parallel pliers (knippex FTW) beforehand. made with freecad, file included to adjust the inner and outer dimensions if needed. ah, and the part is tapered so pay attention while inserting.