Methods and systems to learn an optimal user experience. Linking the devices are a pair of electrical conductors with a fabric cover over at least a part of their length. For example, embodiments of the alloy have a martensitic matrix embedded with isolated carbides andor borides. Accordingly, the inventive VCO device is subject to reduced levels of jitter as its range need not be utilized for overcoming process variation arising during device fabrication. Return to neutral systems ensure that the control handle will return to a centered, neutral position upon release of the control handle by the operator. The optical head includes: a base, including a mounting face having an opening portion; a substrate, operable to supply an electric power to the coil, and including a first portion; and a supporter, mounted on the mounting face, and including a second portion which faces the first portion and which is formed with a recessed portion that is connected with the opening portion.