I'd look for proof that there's a field effect that can pass into a secondary system not mechanically attached.
like two IAT t-shaped items spinning fixed 90 degrees to each other.
Technically they would each spin each other up if correct.
the dean drive supposed space drive....was an asymmetric mass that spun around on a rotating disc. Like an imbalanced gyroscope. They had a pretty good argument. Said if the mass were to accelerate only during a length of arc(like 90 degrees or quarter turn) then left to coast the rest of the time then accelerated again at the same 90 degree arc the whole thing would accelerate in one direction.
If placed in space and constantly accelerated(in pulses) the system would move.
so again, like the IAT effect.
vibrates incredibly violently but they put it in a boat and it moved it.
problem is for any appreciable force, no metals are strong enough for such internal stresses.
so this thing would've also caused the rotating shaft to want to pull at 90degrees and tumble.