  The time-dependent forcing and work per cycle required to drive sinusoidal
spinning of a taut-line buzzer is analytically derived, both on and off
resonance, from the nonlinear equation of motion. To test predictions, a model
experimental system is constructed and characterized in terms of contraction
versus twist angle and damped oscillations. The predicted force profile is then
approximately implemented by hand. Nearly sinusoidal motion is observed, and
the energy injection per cycle needed to maintain steady state oscillations is
found to agree with theory. Additional force profiles are implemented, one to
maximize non-sinusoidal response and one to maximize the response per operator
effort. With the latter, an Aluminum disk of radius 5~cm and height 0.95~cm was
spun at a peak speed of over 11,000~RMP for fifteen minutes. The corresponding
hand-powered centrifuge system would required $1.5\times$ more force, twice the
power, and triple the time in order to run $90\times$ more samples than prior
state-of-art.
