One aspect of the present invention provides a surgical headframe for maintaining a stereotactic system reference frame relative to a patient’s head. The coolant distributor comprises a generally cylindrical body adapted to be coupled to the cutting head about the rotational axis, the generally cylindrical body having a first end and an opposite second end, the first end being disposed adjacent the cutting head when the generally cylindrical body is coupled to the cutting head. Hot liquid, preferably hot water, is passed along the annulus, either along a single pipe or multiple pipes installed in the insulation-filled annulus, or along an inner annulus formed by a water pipe added concentrically around the hydrocarbon-transporting inner pipe, inside the outer insulation-filled annulus. A heat source is provided in the cooking chamber for cooking the food when placed on the cooking rack . The magnetic medium may be protected by an overcoat layer.