Inspired by TheNewHobbyist's thing, I wanted to make one for my model of lamp-arm, and then for other things :)

So these small parts will allow you to mount directly your C910 logitech webcam to :

a lamp-arm like the one in the picture
a 6mm bolt like the one in my small tripod
*or inside a 6mm channel of an aluminium profile

Print
Add an M4x30 bolt and eventually a nut (work without)
Mount

If you don't have access to a 3dprinter, you can order the two small parts at Shapeways : http://www.shapeways.com/model/645547/c910-webcam-mount.html