Abstract: An ice fishing assembly signals a fisherman when a fish has struck and is running with the line, and also keeps a hole defined in the ice open. The various parts of the assembly can be customized according to the size and shape of the hole defined through the ice, and can be replaced as necessary. The circuit elements necessary for the signalling function are mounted in a flexible layer of insulation so that they are protected and need not be replaced to fit a new ice hole. The flexible layer will fit a variety of different holes and is fixed to a central tube while other layers are slidably mounted on that central tube to be replaceable. The flexible layer supports the other layers in place.