These units are built by putting together a standard circular pad (sheet S02) and a flexible compressed air jack.
The deployment of the pad for levitation is obtained by opening the air supply: the jack swings out, the span is limited by stops.
The pad reenters by closing the air supply: the jack swings in, recalled by springs.
These pads are for use with charges when only part of the path is covered in levitation.
Other portions of handling path are covered on wheels, with pads swinged in.