Inspired by another user's servo adaptor I decided to roll my own after having to hack on his to make it work for my servos. I was trying to use an MG996R servo in place of the HS-805BB servo for raising and rotating the head/neck of my InMoov build but the other upload was giving me grief trying to get the MG996R inside it. Since I was making my own with OpenScad, I thought I would make it parametric so other people could reuse it to convert all sorts of servos to all kinds of other servos.The STL should work as is to put a MG996R in place of an HS-805BB but you will still need to deal with the difference in horn height. There's a spacer on Thingiverse for that (http://www.thingiverse.com/thing:70324). For other servos you'll need to adapt the measurements in the scad file yourself.