although I never have, I was thinking of fabricating a piece of metal,( less then the width you the tines of you spear),to be shaped like half a swastika and figure a way to affix it to the floor of shanty,( in a permanent, this would be easy) I was thinking more about how to hook it to the ice. then the spear would rest on the bottom part and actually hang suspended in the water. If the middle part is long enough, the head of the spear would be under water. I was even going to make it in 2 parts, drill a hole in the middle so it could slide up and down to make the center part longer to accommodate the ice thickness. Then, a fish comes in, I am sitting right behind it , grab it and push forward, boom. For now, it just stand against the shanty to my right. I may think about doing this this year