As asked, here is a pic of the machine' well and acrylic.
The well was made for another machine and is not deep enough for my Bernina, so I cover the edges of the hole with an acrylic made to fit around my Bernina and then add the honey comb to level the machine. If I use the honey comb alone it floats. If the well was a little deeper the acrylic alone would do, no need for the honey comb. Because of the way Bernina bobbin loads, is not possible to make the home completely covered. A square hole gives me space to change the bobbin by just moving the acrylic cover. Clear as mud?