Hello Radd47,
looks like that you are a huge 76 fan, to answer your question in a general term (without giving too much away).
Level is going in the right direction some sort of damping device.
Every Nickel core x-former grows by the amount of energy that is put into it, a linear sheet of 1 meter can grow as much as 1 cm while exposed to a magnetic field. If you cast the x-former in an epoxy you end up with a solid mass, that will try to move but can't, so mechanical distortion emerge and are transformed into electrical ones.
Most plastics/epoxy interfere with either the magnetic,- electrical field (reducing or amplifying it) or become some sort of conductors that shorting out the turns , so specialty material is needed.
If you loosely suspend the coils, they will grow and retract by the given room, so you end up with no or the smallest amount of mechanical distortion.
Best regards,