A capacitive structure including single crystal silicon and an insulating layer in a semiconductor substrate. The filtering circuit has a coefficient a defined by a fundamental formula: an+1=an+\u03b2\xb7en\xb7qnpn. The thermal medium print starting position is located under a heating element of the thermal printhead. The bearings are adapted to minimize friction between the core member and the buckling restraining apparatus. Also provided are methods of using the device. A cap nut made of a plastic material is fastened to the stud, the plastic material permitting self-locking.