Certain disclosed embodiments concern making sports equipment, such as golf club heads, using polishing marks to facilitate removing material from as-cast work pieces to produce a final thickness within a desired specification, such as 0. Thus in some embodiments conventional operational amplifier circuits and relaxation oscillators may be replaced for generating triangular ramp waveforms for DC to DC or direct time-based DC to DC converters. The cover plate is made from an acrylic or polycarbonate plastic that can be clear, translucent, transparent, or partially opaque. In one example, the device has a separate processor that drives the low-power display, so that the low-power display can be used while the device is in sleep mode or off. The benzoxazine group enhances the compatibility between a polysiloxane polymer and a conventional organic polymeric material, functions as a polymer flame retardant or reaction-oriented additive, and widens the application of a polysiloxane polymer to organic polymeric materials in property adjustment and the applicability of the organic polymeric materials.