Shen Hao 6x17 roll film back - masking?

Hello all, I was hoping that any users of the Shen Hao 6x17 roll film back may be able to help me? Supplied with the film back is a pair of felt covered "baffles" - are these to mask the film gate (to 6x12? ) If so how do you fit them? If they are not intended for this what exactly are they for?? Oh for a simple set of instructions!! many thanks Paul

Mine came with metal masks which attach just in front of the film plane with two screws each side.

Paul,

I'm not sure if I have answered you already on this topic. Simply remove the metal darkslide, reach into the back through the opening and slide the baffles into the edges of the frame.

Thanks! Got it sorted now!!