Mamiya Universal ground glass viewing back sheet film question

[murrayatuptowngallery]

I picked up a 'mystery' 6x9 ground glass back that I would describe

as a spring back for sheet film holders.

 

A few searches confirmed it's for a Press Universal. I was going to

use it for a homebrew project and got some Graflex 2-1/4 x 3-1/4

wooden holders.

 

When I finally tried to put them together, surprise! The wooden

holders are too tall!

 

Did the Mamiya back use proprietary sheet film holders or was is

smaller than 2-1/4 x 3-1/4?

 

Thanks

[findranger]

I have the GG "spring" back for my Universal that accepts the Mamiya Pack Film holders (there was also a "plain" GG as well) which are proprietary. I used to have the Pack Film holders and they were specified as being 6.5 x 9cm (2.5 x 3.5in.) as marked on their original boxes (image area size), but they obviously seem to be smaller overall than your wooden holders.

 

Most, if not all, of the components of the Mamiya Press system are proprietary, with the exception of being able to use some accessories from the RB67.

 

Good luck with your project.<div></div>

[murrayatuptowngallery]

Thank you.