Rolleiflex T which parts are made of plastic?

I know there is a belt that convey the shutter and aperture value to the indicators and apart from that, are there any other parts which are made of plastic?

Meter/indicator windows, insulative parts, some light seals and spacers. No structural or load bearing components. Later production runs can use some plastic bushings in the film transport. These can rarely cause uneven frame spacing if they become misshapen.