These various arms, tilts, swivels, and brackets can be used to mount a Logitech C270 or C920 webcam to an articulated arm from an IKEA Tertial work lamp. The weighted stand on on either webcam must be removed--the extra weight sure does wobble the arm!
The holes are all size for M3 screws. The Logitech C270/C310 camera is attached to the mount with an M3 screw. The Logitech C920 just snaps into place.
I am also using my adapter to attach the IKEA lamp to my "Mount It!" brand monitor stand.