It's hard to say. The problem with a secondary driver is that they need pretty good rhythm to stay in sync.
I did end up getting a second lead weight to add to the crankshaft to increase the flywheel effect there. Anything to help smooth out the motion through the dead zones at the top and bottom of the stroke.
I think the secondary driver in your fourth road test video has demonstrated an excellent sense of rhythm in filk circles--but that's when she's not laughing maniacally.
no subject
I did end up getting a second lead weight to add to the crankshaft to increase the flywheel effect there. Anything to help smooth out the motion through the dead zones at the top and bottom of the stroke.
no subject