Well I got tiered of using a wrench and nut to clamp down my parts so I made a few of these, Knobs like that with 1/4" thread inside are almost $3.00 at the hardware store (must be proud of them or something) so i made a few of my own.
Here is a picture of some and also the g-code if people want to make their own, (.25 end mill 3/4" stock) Rename the *.Zip ext. to *.Tap can not upload the file otherwise.