Have a 3x4 anniversary speed graphic with a spring back. Will a 3x4 film pack adapter slide into it? Its thicker than a regular film holder, didn't want to try it without verifying first.
Have two of them and thinking of adapting them for dry plate, or for use with Fugi wide Instax film.

One thing about Graphic backs, they will tell you their limit if you try to exceed it. Some Graphic backs will accept grafmatics while others will not. If the FPA will not fit it will not go beyond half way in or if at the spring travel limit be very hard to push in. If it gets stuck loosen the spring mount screws 1/2 to 1 1/2 turns in half turn increments until it comes out.

A standard flat washer for the spring mount screw can be put between the body and the spring to give the back extra clearance without compromising the integrity of the back.

Ok will gave it a try... no problem... thanks .. now unto a new adventure.