pet / child gate anchor

I measured my child gate's pads as being 35mm in diameter so the inner diameter of these anchors is 36mm. Fits pretty well. If yours are of a different size, changing the values in scad script is pretty easy. I did not go all the way to parametrize it, as I doubt many people will actually need this (or custom versions of it anyway), but if there's need for it (and you can't do it yourself), just ping me.