I am trying to make a device mount that will clamp around the rails of a bike seat. I have the shape of the rails (blue) from an imported STL file and have Boolean differenced them to create the corresponding hollow spaces in this block (yellow). I now need to divide the block into a top and bottom half that will clamp around the rails. The cut line needs to follow the centerline of the rail so that each half can fit around the rails. So far I have tried to recreate the rail shape as a Bezier curve but I could not perfectly capture the shape and I need the fit to be exact. TIA!