About This File
NSD Neck Blocks - Sketchup files are in the Thingiverse thing at http://www.thingiverse.com/thing:727027 since PDF doesn't seem to like them in the post, in case you need to modify the hole.
I think they turned out fairly nice. They have fatter backs than fronts and match the PDF as well as I could. I had trouble finding the exact dimensions for the corner rounding or the position of the bearing though, but I'm happy with it. The hollow version is intended to snap a 14mm bearing into it, however I'm not sure it'll fit (I don't have one to try). Looking at it, it seems like the edges come in a little much, but it seems to align with both the PDF and photos I found, so...
Now I just need to print another 23 of them!