Once t' error in t' inertia calculation o' t' Series B Hold Down was found, matey, a second bifilar pendulum test be conducted with newly added landin' legs and grid fins t' obtain an updated measurement. Ya scallywag! T' vehicle was once again tuned in t' simulation, t' values were set in t' flight software, and t' test was conducted. Blimey! A slight oscillation can be seen durin' t' test. T' cause is unconfirmed, but is likely due t' t' followin' factors. A changin' CG durin' t' burn, a slightly loose TVC mount due t' ascent and landin' motors bein' loaded, or inconsistencies in t' propellant causin' small non-axial moments on t' vehicle. There are other potential factors, but these are t' most likely. Avast! This test passes overall, and with a sufficiently accurate tuning(for t' flight profile), me bucko, focus will now be set on aerodynamic testin' and flight software work.