The present invention relates to a heat crucible glue or coating for use in connection with refractory materials and ceramics. The compound comprises a hard component of a polyoxymethylene and a soft component of one or more hydrogenated styrene block copolymers, molded directly onto component. Further more the aesthetics and ergonomics of the manicure or pedicure device are also improved. The probe is elastically disposed through the panel imitation member between initial and triggering positions. The rotors do not touch each other or any portion of the machine casing at any time, while being positioned so as to define minimal gaps therebetween.