Device leakage due to spacer undercutting is remedied by depositing a BPSG, SA-CVD oxide liner and flowing it into the undercut regions, followed by gap filling with a P-doped HDP oxide layer. The tubular body is provided with an outer-circumferential centering reference surface and a center axis of the centering reference surface. A spur gear is mounted to the second module and can engage the rack of the tongue received into the cavity. The tension members are selectively engaged to the platform to increase or decrease the tension applied to the platform for varying levels of workouts.