Once t' error in t' inertia calculation o' t' Series B Hold Down be found, shiver me timbers, a second bifilar pendulum test was conducted with newly added landin' legs and grid fins t' obtain an updated measurement. T' vehicle was once again tuned in t' simulation, t' values were set in t' flight software, arrr, and t' test be conducted. Blimey! A slight oscillation can be seen durin' t' test. T' cause is unconfirmed, but is likely due t' t' followin' factors. Ya scallywag! 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, matey, but these are t' most likely. Avast, me proud beauty! This test passes overall, and with a sufficiently accurate tuning(for t' flight profile), focus will now be set on aerodynamic testin' and flight software work.